diff --git a/morris.coffee b/morris.coffee
index 755b286..3cb552d 100644
--- a/morris.coffee
+++ b/morris.coffee
@@ -14,6 +14,10 @@ class Morris.Line
       @el = $ document.getElementById(options.element)
     else
       @el = $ options.element
+
+    if @el == null || @el.length == 0
+      throw new Error("Graph placeholder not found.")
+
     @options = $.extend {}, @defaults, options
     # backwards compatibility for units -> postUnits
     if typeof @options.units is 'string'
diff --git a/morris.js b/morris.js
index d9e53a9..e0f775a 100644
--- a/morris.js
+++ b/morris.js
@@ -29,6 +29,9 @@
       } else {
         this.el = $(options.element);
       }
+      if (this.el === null || this.el.length === 0) {
+        throw new Error("Graph placeholder not found.");
+      }
       this.options = $.extend({}, this.defaults, options);
       if (typeof this.options.units === 'string') {
         this.options.postUnits = options.units;
diff --git a/morris.min.js b/morris.min.js
index c1d82cc..96d1a80 100644
--- a/morris.min.js
+++ b/morris.min.js
@@ -1,2 +1,2 @@
 // Generated by CoffeeScript 1.3.1
-(function(){var a,b,c,d,e,f=function(a,b){return function(){return a.apply(b,arguments)}};a=jQuery,b={},b.Line=function(){function d(d){this.updateHilight=f(this.updateHilight,this),this.hilight=f(this.hilight,this),this.updateHover=f(this.updateHover,this),this.transY=f(this.transY,this),this.transX=f(this.transX,this);if(!(this instanceof b.Line))return new b.Line(d);typeof d.element=="string"?this.el=a(document.getElementById(d.element)):this.el=a(d.element),this.options=a.extend({},this.defaults,d),typeof this.options.units=="string"&&(this.options.postUnits=d.units);if(this.options.data===void 0||this.options.data.length===0)return;this.options.data=c(this.options.data),this.el.addClass("graph-initialised"),this.precalc(),this.redraw()}return d.name="Line",d.prototype.defaults={lineWidth:3,pointSize:4,lineColors:["#0b62a4","#7A92A3","#4da74d","#afd8f8","#edc240","#cb4b4b","#9440ed"],ymax:"auto",ymin:"auto 0",marginTop:25,marginRight:25,marginBottom:30,marginLeft:25,numLines:5,gridLineColor:"#aaa",gridTextColor:"#888",gridTextSize:12,gridStrokeWidth:.5,hoverPaddingX:10,hoverPaddingY:5,hoverMargin:10,hoverFillColor:"#fff",hoverBorderColor:"#ccc",hoverBorderWidth:2,hoverOpacity:.95,hoverLabelColor:"#444",hoverFontSize:12,smooth:!0,hideHover:!1,parseTime:!0,preUnits:"",postUnits:"",dateFormat:function(a){return(new Date(a)).toString()},xLabels:"auto",xLabelFormat:null},d.prototype.precalc=function(){var c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r=this;this.options.data.sort(function(a,b){return(a[r.options.xkey]<b[r.options.xkey])-(b[r.options.xkey]<a[r.options.xkey])}),this.columnLabels=a.map(this.options.data,function(a){return a[r.options.xkey]}),this.seriesLabels=this.options.labels,this.series=[],n=this.options.ykeys;for(i=0,l=n.length;i<l;i++){f=n[i],d=[],o=this.options.data;for(j=0,m=o.length;j<m;j++)c=o[j],d.push(c[f]||null);this.series.push(d)}return this.options.parseTime?this.xvals=a.map(this.columnLabels,function(a){return b.parseDate(a)}):this.xvals=function(){q=[];for(var a=p=this.columnLabels.length-1;p<=0?a<=0:a>=0;p<=0?a++:a--)q.push(a);return q}.apply(this),this.options.parseTime&&(this.columnLabels=a.map(this.columnLabels,function(a){return typeof a=="number"?r.options.dateFormat(a):a})),this.xmin=Math.min.apply(null,this.xvals),this.xmax=Math.max.apply(null,this.xvals),this.xmin===this.xmax&&(this.xmin-=1,this.xmax+=1),typeof this.options.ymax=="string"&&this.options.ymax.slice(0,4)==="auto"&&(g=Math.max.apply(null,Array.prototype.concat.apply([],this.series)),this.options.ymax.length>5?this.options.ymax=Math.max(parseInt(this.options.ymax.slice(5),10),g):this.options.ymax=g),typeof this.options.ymin=="string"&&this.options.ymin.slice(0,4)==="auto"&&(h=Math.min.apply(null,Array.prototype.concat.apply([],this.series)),this.options.ymin.length>5?this.options.ymin=Math.min(parseInt(this.options.ymin.slice(5),10),h):this.options.ymin=h),this.pointGrow=Raphael.animation({r:this.options.pointSize+3},25,"linear"),this.pointShrink=Raphael.animation({r:this.options.pointSize},25,"linear"),this.elementWidth=null,this.elementHeight=null,this.prevHilight=null,this.el.mousemove(function(a){return r.updateHilight(a.pageX)}),this.options.hideHover&&this.el.mouseout(function(a){return r.hilight(null)}),e=function(a){var b;return b=a.originalEvent.touches[0]||a.originalEvent.changedTouches[0],r.updateHilight(b.pageX),b},this.el.bind("touchstart",e),this.el.bind("touchmove",e),this.el.bind("touchend",e)},d.prototype.calc=function(){var b,c,d,e,f,g,h,i,j=this;e=this.el.width(),b=this.el.height();if(this.elementWidth!==e||this.elementHeight!==b){this.maxYLabelWidth=Math.max(this.measureText(this.yLabelFormat(this.options.ymin),this.options.gridTextSize).width,this.measureText(this.yLabelFormat(this.options.ymax),this.options.gridTextSize).width),this.left=this.maxYLabelWidth+this.options.marginLeft,this.width=this.el.width()-this.left-this.options.marginRight,this.height=this.el.height()-this.options.marginTop-this.options.marginBottom,this.dx=this.width/(this.xmax-this.xmin),this.dy=this.height/(this.options.ymax-this.options.ymin),this.columns=function(){var a,b,c,d;c=this.xvals,d=[];for(a=0,b=c.length;a<b;a++)f=c[a],d.push(this.transX(f));return d}.call(this),this.seriesCoords=[],i=this.series;for(g=0,h=i.length;g<h;g++)c=i[g],d=[],a.each(c,function(a,b){return b===null?d.push(null):d.push({x:j.columns[a],y:j.transY(b)})}),this.seriesCoords.push(d);return this.hoverMargins=a.map(this.columns.slice(1),function(a,b){return(a+j.columns[b])/2})}},d.prototype.transX=function(a){return this.xvals.length===1?this.left+this.width/2:this.left+(a-this.xmin)*this.dx},d.prototype.transY=function(a){return this.options.marginTop+this.height-(a-this.options.ymin)*this.dy},d.prototype.redraw=function(){return this.el.empty(),this.r=new Raphael(this.el[0]),this.calc(),this.drawGrid(),this.drawSeries(),this.drawHover(),this.hilight(this.options.hideHover?null:0)},d.prototype.drawGrid=function(){var a,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w=this;m=(this.options.ymax-this.options.ymin)/(this.options.numLines-1),c=Math.ceil(this.options.ymin/m)*m,g=Math.floor(this.options.ymax/m)*m;for(h=o=c;c<=g?o<=g:o>=g;h=o+=m)j=Math.floor(h),l=this.transY(j),this.r.text(this.left-this.options.marginLeft/2,l,this.yLabelFormat(j)).attr("font-size",this.options.gridTextSize).attr("fill",this.options.gridTextColor).attr("text-anchor","end"),this.r.path("M"+this.left+","+l+"H"+(this.left+this.width)).attr("stroke",this.options.gridLineColor).attr("stroke-width",this.options.gridStrokeWidth);n=this.options.marginTop+this.height+this.options.marginBottom/2,k=50,i=null,a=function(a,b){var c,d;return c=w.r.text(w.transX(b),n,a).attr("font-size",w.options.gridTextSize).attr("fill",w.options.gridTextColor),d=c.getBBox(),i===null||i<=d.x?i=d.x+d.width+k:c.remove()};if(this.options.parseTime){if(this.columnLabels.length===1&&this.options.xLabels==="auto")return a(this.columnLabels[0],this.xvals[0]);s=b.labelSeries(this.xmin,this.xmax,this.width,this.options.xLabels,this.options.xLabelFormat),u=[];for(p=0,r=s.length;p<r;p++)e=s[p],u.push(a(e[0],e[1]));return u}v=[];for(d=q=0,t=this.columnLabels.length;0<=t?q<=t:q>=t;d=0<=t?++q:--q)f=this.columnLabels[this.columnLabels.length-d-1],v.push(a(f,d));return v},d.prototype.drawSeries=function(){var a,b,c,d,e,f,g,h,i,j;for(d=f=h=this.seriesCoords.length-1;h<=0?f<=0:f>=0;d=h<=0?++f:--f)c=this.seriesCoords[d],c.length>1&&(e=this.createPath(c,this.options.marginTop,this.left,this.options.marginTop+this.height,this.left+this.width),this.r.path(e).attr("stroke",this.options.lineColors[d]).attr("stroke-width",this.options.lineWidth));this.seriesPoints=function(){var a,b,c;c=[];for(d=a=0,b=this.seriesCoords.length-1;0<=b?a<=b:a>=b;d=0<=b?++a:--a)c.push([]);return c}.call(this),j=[];for(d=g=i=this.seriesCoords.length-1;i<=0?g<=0:g>=0;d=i<=0?++g:--g)j.push(function(){var c,e,f,g;f=this.seriesCoords[d],g=[];for(c=0,e=f.length;c<e;c++)a=f[c],a===null?b=null:b=this.r.circle(a.x,a.y,this.options.pointSize).attr("fill",this.options.lineColors[d]).attr("stroke-width",1).attr("stroke","#ffffff"),g.push(this.seriesPoints[d].push(b));return g}.call(this));return j},d.prototype.createPath=function(b,c,d,e,f){var g,h,i,j,k,l,m,n,o,p,q,r,s,t,u;o="",h=a.map(b,function(a){return a});if(this.options.smooth){j=this.gradients(h);for(k=t=0,u=h.length-1;0<=u?t<=u:t>=u;k=0<=u?++t:--t)g=h[k],k===0?o+="M"+g.x+","+g.y:(i=j[k],m=h[k-1],n=j[k-1],l=(g.x-m.x)/4,p=m.x+l,r=Math.min(e,m.y+l*n),q=g.x-l,s=Math.min(e,g.y-l*i),o+="C"+p+","+r+","+q+","+s+","+g.x+","+g.y)}else o="M"+a.map(h,function(a){return""+a.x+","+a.y}).join("L");return o},d.prototype.gradients=function(b){return a.map(b,function(a,c){return c===0?(b[1].y-a.y)/(b[1].x-a.x):c===b.length-1?(a.y-b[c-1].y)/(a.x-b[c-1].x):(b[c+1].y-b[c-1].y)/(b[c+1].x-b[c-1].x)})},d.prototype.drawHover=function(){var a,b,c,d,e;this.hoverHeight=this.options.hoverFontSize*1.5*(this.series.length+1),this.hover=this.r.rect(-10,-this.hoverHeight/2-this.options.hoverPaddingY,20,this.hoverHeight+this.options.hoverPaddingY*2,10).attr("fill",this.options.hoverFillColor).attr("stroke",this.options.hoverBorderColor).attr("stroke-width",this.options.hoverBorderWidth).attr("opacity",this.options.hoverOpacity),this.xLabel=this.r.text(0,this.options.hoverFontSize*.75-this.hoverHeight/2,"").attr("fill",this.options.hoverLabelColor).attr("font-weight","bold").attr("font-size",this.options.hoverFontSize),this.hoverSet=this.r.set(),this.hoverSet.push(this.hover),this.hoverSet.push(this.xLabel),this.yLabels=[],e=[];for(a=c=0,d=this.series.length-1;0<=d?c<=d:c>=d;a=0<=d?++c:--c)b=this.r.text(0,this.options.hoverFontSize*1.5*(a+1.5)-this.hoverHeight/2,"").attr("fill",this.options.lineColors[a]).attr("font-size",this.options.hoverFontSize),this.yLabels.push(b),e.push(this.hoverSet.push(b));return e},d.prototype.updateHover=function(b){var c,d,e,f,g,h,i=this;this.hoverSet.show(),this.xLabel.attr("text",this.columnLabels[b]);for(c=g=0,h=this.series.length-1;0<=h?g<=h:g>=h;c=0<=h?++g:--g)this.yLabels[c].attr("text",""+this.seriesLabels[c]+": "+this.yLabelFormat(this.series[c][b]));return d=Math.max.apply(null,a.map(this.yLabels,function(a){return a.getBBox().width})),d=Math.max(d,this.xLabel.getBBox().width),this.hover.attr("width",d+this.options.hoverPaddingX*2),this.hover.attr("x",-this.options.hoverPaddingX-d/2),f=Math.min.apply(null,a.map(this.series,function(a){return i.transY(a[b])})),f>this.hoverHeight+this.options.hoverPaddingY*2+this.options.hoverMargin+this.options.marginTop?f=f-this.hoverHeight/2-this.options.hoverPaddingY-this.options.hoverMargin:f=f+this.hoverHeight/2+this.options.hoverPaddingY+this.options.hoverMargin,f=Math.max(this.options.marginTop+this.hoverHeight/2+this.options.hoverPaddingY,f),f=Math.min(this.options.marginTop+this.height-this.hoverHeight/2-this.options.hoverPaddingY,f),e=Math.min(this.left+this.width-d/2-this.options.hoverPaddingX,this.columns[b]),e=Math.max(this.left+d/2+this.options.hoverPaddingX,e),this.hoverSet.attr("transform","t"+e+","+f)},d.prototype.hideHover=function(){return this.hoverSet.hide()},d.prototype.hilight=function(a){var b,c,d,e,f;if(this.prevHilight!==null&&this.prevHilight!==a)for(b=c=0,e=this.seriesPoints.length-1;0<=e?c<=e:c>=e;b=0<=e?++c:--c)this.seriesPoints[b][this.prevHilight]&&this.seriesPoints[b][this.prevHilight].animate(this.pointShrink);if(a!==null&&this.prevHilight!==a){for(b=d=0,f=this.seriesPoints.length-1;0<=f?d<=f:d>=f;b=0<=f?++d:--d)this.seriesPoints[b][a]&&this.seriesPoints[b][a].animate(this.pointGrow);this.updateHover(a)}this.prevHilight=a;if(a===null)return this.hideHover()},d.prototype.updateHilight=function(a){var b,c,d,e;a-=this.el.offset().left,e=[];for(b=c=d=this.hoverMargins.length;d<=0?c<=0:c>=0;b=d<=0?++c:--c){if(b===0||this.hoverMargins[b-1]>a){this.hilight(b);break}e.push(void 0)}return e},d.prototype.measureText=function(a,b){var c,d;return b==null&&(b=12),d=this.r.text(100,100,a).attr("font-size",b),c=d.getBBox(),d.remove(),c},d.prototype.yLabelFormat=function(a){return""+this.options.preUnits+b.commas(a)+this.options.postUnits},d}(),b.parseDate=function(a){var b,c,d,e,f,g,h,i,j,k,l;return typeof a=="number"?a:(c=a.match(/^(\d+) Q(\d)$/),e=a.match(/^(\d+)-(\d+)$/),f=a.match(/^(\d+)-(\d+)-(\d+)$/),h=a.match(/^(\d+) W(\d+)$/),i=a.match(/^(\d+)-(\d+)-(\d+)[ T](\d+):(\d+)(Z|([+-])(\d\d):?(\d\d))?$/),j=a.match(/^(\d+)-(\d+)-(\d+)[ T](\d+):(\d+):(\d+(\.\d+)?)(Z|([+-])(\d\d):?(\d\d))?$/),c?(new Date(parseInt(c[1],10),parseInt(c[2],10)*3-1,1)).getTime():e?(new Date(parseInt(e[1],10),parseInt(e[2],10)-1,1)).getTime():f?(new Date(parseInt(f[1],10),parseInt(f[2],10)-1,parseInt(f[3],10))).getTime():h?(k=new Date(parseInt(h[1],10),0,1),k.getDay()!==4&&k.setMonth(0,1+(4-k.getDay()+7)%7),k.getTime()+parseInt(h[2],10)*6048e5):i?i[6]?(g=0,i[6]!=="Z"&&(g=parseInt(i[8],10)*60+parseInt(i[9],10),i[7]==="+"&&(g=0-g)),Date.UTC(parseInt(i[1],10),parseInt(i[2],10)-1,parseInt(i[3],10),parseInt(i[4],10),parseInt(i[5],10)+g)):(new Date(parseInt(i[1],10),parseInt(i[2],10)-1,parseInt(i[3],10),parseInt(i[4],10),parseInt(i[5],10))).getTime():j?(l=parseFloat(j[6]),b=Math.floor(l),d=Math.round((l-b)*1e3),j[8]?(g=0,j[8]!=="Z"&&(g=parseInt(j[10],10)*60+parseInt(j[11],10),j[9]==="+"&&(g=0-g)),Date.UTC(parseInt(j[1],10),parseInt(j[2],10)-1,parseInt(j[3],10),parseInt(j[4],10),parseInt(j[5],10)+g,b,d)):(new Date(parseInt(j[1],10),parseInt(j[2],10)-1,parseInt(j[3],10),parseInt(j[4],10),parseInt(j[5],10),b,d)).getTime()):(new Date(parseInt(a,10),0,1)).getTime())},b.commas=function(a){var b,c,d,e;return a===null?"n/a":(d=a<0?"-":"",b=Math.abs(a),c=Math.floor(b).toFixed(0),d+=c.replace(/(?=(?:\d{3})+$)(?!^)/g,","),e=b.toString(),e.length>c.length&&(d+=e.slice(c.length)),d)},b.pad2=function(a){return(a<10?"0":"")+a},b.labelSeries=function(c,d,e,f,g){var h,i,j,k,l,m,n,o,p,q,r;j=200*(d-c)/e,i=new Date(c),n=b.LABEL_SPECS[f];if(n===void 0){r=b.AUTO_LABEL_ORDER;for(p=0,q=r.length;p<q;p++){k=r[p],m=b.LABEL_SPECS[k];if(j>=m.span){n=m;break}}}n===void 0&&(n=b.LABEL_SPECS.second),g&&(n=a.extend({},n,{fmt:g})),h=n.start(i),l=[];while((o=h.getTime())<=d)o>=c&&l.push([n.fmt(h),o]),n.incr(h);return l},c=function(a){var b,d,e;if(a==null||typeof a!="object")return a;if(a instanceof Date)return new Date(a.getTime());if(a instanceof RegExp)return b="",a.global!=null&&(b+="g"),a.ignoreCase!=null&&(b+="i"),a.multiline!=null&&(b+="m"),a.sticky!=null&&(b+="y"),new RegExp(a.source,b);e=new a.constructor;for(d in a)e[d]=c(a[d]);return e},d=function(a){return{span:a*60*1e3,start:function(a){return new Date(a.getFullYear(),a.getMonth(),a.getDate(),a.getHours())},fmt:function(a){return""+b.pad2(a.getHours())+":"+b.pad2(a.getMinutes())},incr:function(b){return b.setMinutes(b.getMinutes()+a)}}},e=function(a){return{span:a*1e3,start:function(a){return new Date(a.getFullYear(),a.getMonth(),a.getDate(),a.getHours(),a.getMinutes())},fmt:function(a){return""+b.pad2(a.getHours())+":"+b.pad2(a.getMinutes())+":"+b.pad2(a.getSeconds())},incr:function(b){return b.setSeconds(b.getSeconds()+a)}}},b.LABEL_SPECS={year:{span:1728e7,start:function(a){return new Date(a.getFullYear(),0,1)},fmt:function(a){return""+a.getFullYear()},incr:function(a){return a.setFullYear(a.getFullYear()+1)}},month:{span:24192e5,start:function(a){return new Date(a.getFullYear(),a.getMonth(),1)},fmt:function(a){return""+a.getFullYear()+"-"+b.pad2(a.getMonth()+1)},incr:function(a){return a.setMonth(a.getMonth()+1)}},day:{span:864e5,start:function(a){return new Date(a.getFullYear(),a.getMonth(),a.getDate())},fmt:function(a){return""+a.getFullYear()+"-"+b.pad2(a.getMonth()+1)+"-"+b.pad2(a.getDate())},incr:function(a){return a.setDate(a.getDate()+1)}},hour:d(60),"30min":d(30),"15min":d(15),"10min":d(10),"5min":d(5),minute:d(1),"30sec":e(30),"15sec":e(15),"10sec":e(10),"5sec":e(5),second:e(1)},b.AUTO_LABEL_ORDER=["year","month","day","hour","30min","15min","10min","5min","minute","30sec","15sec","10sec","5sec","second"],window.Morris=b}).call(this);
\ No newline at end of file
+(function(){var a,b,c,d,e,f=function(a,b){return function(){return a.apply(b,arguments)}};a=jQuery,b={},b.Line=function(){function d(d){this.updateHilight=f(this.updateHilight,this),this.hilight=f(this.hilight,this),this.updateHover=f(this.updateHover,this),this.transY=f(this.transY,this),this.transX=f(this.transX,this);if(!(this instanceof b.Line))return new b.Line(d);typeof d.element=="string"?this.el=a(document.getElementById(d.element)):this.el=a(d.element);if(this.el===null||this.el.length===0)throw new Error("Graph placeholder not found.");this.options=a.extend({},this.defaults,d),typeof this.options.units=="string"&&(this.options.postUnits=d.units);if(this.options.data===void 0||this.options.data.length===0)return;this.options.data=c(this.options.data),this.el.addClass("graph-initialised"),this.precalc(),this.redraw()}return d.name="Line",d.prototype.defaults={lineWidth:3,pointSize:4,lineColors:["#0b62a4","#7A92A3","#4da74d","#afd8f8","#edc240","#cb4b4b","#9440ed"],ymax:"auto",ymin:"auto 0",marginTop:25,marginRight:25,marginBottom:30,marginLeft:25,numLines:5,gridLineColor:"#aaa",gridTextColor:"#888",gridTextSize:12,gridStrokeWidth:.5,hoverPaddingX:10,hoverPaddingY:5,hoverMargin:10,hoverFillColor:"#fff",hoverBorderColor:"#ccc",hoverBorderWidth:2,hoverOpacity:.95,hoverLabelColor:"#444",hoverFontSize:12,smooth:!0,hideHover:!1,parseTime:!0,preUnits:"",postUnits:"",dateFormat:function(a){return(new Date(a)).toString()},xLabels:"auto",xLabelFormat:null},d.prototype.precalc=function(){var c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r=this;this.options.data.sort(function(a,b){return(a[r.options.xkey]<b[r.options.xkey])-(b[r.options.xkey]<a[r.options.xkey])}),this.columnLabels=a.map(this.options.data,function(a){return a[r.options.xkey]}),this.seriesLabels=this.options.labels,this.series=[],n=this.options.ykeys;for(i=0,l=n.length;i<l;i++){f=n[i],d=[],o=this.options.data;for(j=0,m=o.length;j<m;j++)c=o[j],d.push(c[f]||null);this.series.push(d)}return this.options.parseTime?this.xvals=a.map(this.columnLabels,function(a){return b.parseDate(a)}):this.xvals=function(){q=[];for(var a=p=this.columnLabels.length-1;p<=0?a<=0:a>=0;p<=0?a++:a--)q.push(a);return q}.apply(this),this.options.parseTime&&(this.columnLabels=a.map(this.columnLabels,function(a){return typeof a=="number"?r.options.dateFormat(a):a})),this.xmin=Math.min.apply(null,this.xvals),this.xmax=Math.max.apply(null,this.xvals),this.xmin===this.xmax&&(this.xmin-=1,this.xmax+=1),typeof this.options.ymax=="string"&&this.options.ymax.slice(0,4)==="auto"&&(g=Math.max.apply(null,Array.prototype.concat.apply([],this.series)),this.options.ymax.length>5?this.options.ymax=Math.max(parseInt(this.options.ymax.slice(5),10),g):this.options.ymax=g),typeof this.options.ymin=="string"&&this.options.ymin.slice(0,4)==="auto"&&(h=Math.min.apply(null,Array.prototype.concat.apply([],this.series)),this.options.ymin.length>5?this.options.ymin=Math.min(parseInt(this.options.ymin.slice(5),10),h):this.options.ymin=h),this.pointGrow=Raphael.animation({r:this.options.pointSize+3},25,"linear"),this.pointShrink=Raphael.animation({r:this.options.pointSize},25,"linear"),this.elementWidth=null,this.elementHeight=null,this.prevHilight=null,this.el.mousemove(function(a){return r.updateHilight(a.pageX)}),this.options.hideHover&&this.el.mouseout(function(a){return r.hilight(null)}),e=function(a){var b;return b=a.originalEvent.touches[0]||a.originalEvent.changedTouches[0],r.updateHilight(b.pageX),b},this.el.bind("touchstart",e),this.el.bind("touchmove",e),this.el.bind("touchend",e)},d.prototype.calc=function(){var b,c,d,e,f,g,h,i,j=this;e=this.el.width(),b=this.el.height();if(this.elementWidth!==e||this.elementHeight!==b){this.maxYLabelWidth=Math.max(this.measureText(this.yLabelFormat(this.options.ymin),this.options.gridTextSize).width,this.measureText(this.yLabelFormat(this.options.ymax),this.options.gridTextSize).width),this.left=this.maxYLabelWidth+this.options.marginLeft,this.width=this.el.width()-this.left-this.options.marginRight,this.height=this.el.height()-this.options.marginTop-this.options.marginBottom,this.dx=this.width/(this.xmax-this.xmin),this.dy=this.height/(this.options.ymax-this.options.ymin),this.columns=function(){var a,b,c,d;c=this.xvals,d=[];for(a=0,b=c.length;a<b;a++)f=c[a],d.push(this.transX(f));return d}.call(this),this.seriesCoords=[],i=this.series;for(g=0,h=i.length;g<h;g++)c=i[g],d=[],a.each(c,function(a,b){return b===null?d.push(null):d.push({x:j.columns[a],y:j.transY(b)})}),this.seriesCoords.push(d);return this.hoverMargins=a.map(this.columns.slice(1),function(a,b){return(a+j.columns[b])/2})}},d.prototype.transX=function(a){return this.xvals.length===1?this.left+this.width/2:this.left+(a-this.xmin)*this.dx},d.prototype.transY=function(a){return this.options.marginTop+this.height-(a-this.options.ymin)*this.dy},d.prototype.redraw=function(){return this.el.empty(),this.r=new Raphael(this.el[0]),this.calc(),this.drawGrid(),this.drawSeries(),this.drawHover(),this.hilight(this.options.hideHover?null:0)},d.prototype.drawGrid=function(){var a,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w=this;m=(this.options.ymax-this.options.ymin)/(this.options.numLines-1),c=Math.ceil(this.options.ymin/m)*m,g=Math.floor(this.options.ymax/m)*m;for(h=o=c;c<=g?o<=g:o>=g;h=o+=m)j=Math.floor(h),l=this.transY(j),this.r.text(this.left-this.options.marginLeft/2,l,this.yLabelFormat(j)).attr("font-size",this.options.gridTextSize).attr("fill",this.options.gridTextColor).attr("text-anchor","end"),this.r.path("M"+this.left+","+l+"H"+(this.left+this.width)).attr("stroke",this.options.gridLineColor).attr("stroke-width",this.options.gridStrokeWidth);n=this.options.marginTop+this.height+this.options.marginBottom/2,k=50,i=null,a=function(a,b){var c,d;return c=w.r.text(w.transX(b),n,a).attr("font-size",w.options.gridTextSize).attr("fill",w.options.gridTextColor),d=c.getBBox(),i===null||i<=d.x?i=d.x+d.width+k:c.remove()};if(this.options.parseTime){if(this.columnLabels.length===1&&this.options.xLabels==="auto")return a(this.columnLabels[0],this.xvals[0]);s=b.labelSeries(this.xmin,this.xmax,this.width,this.options.xLabels,this.options.xLabelFormat),u=[];for(p=0,r=s.length;p<r;p++)e=s[p],u.push(a(e[0],e[1]));return u}v=[];for(d=q=0,t=this.columnLabels.length;0<=t?q<=t:q>=t;d=0<=t?++q:--q)f=this.columnLabels[this.columnLabels.length-d-1],v.push(a(f,d));return v},d.prototype.drawSeries=function(){var a,b,c,d,e,f,g,h,i,j;for(d=f=h=this.seriesCoords.length-1;h<=0?f<=0:f>=0;d=h<=0?++f:--f)c=this.seriesCoords[d],c.length>1&&(e=this.createPath(c,this.options.marginTop,this.left,this.options.marginTop+this.height,this.left+this.width),this.r.path(e).attr("stroke",this.options.lineColors[d]).attr("stroke-width",this.options.lineWidth));this.seriesPoints=function(){var a,b,c;c=[];for(d=a=0,b=this.seriesCoords.length-1;0<=b?a<=b:a>=b;d=0<=b?++a:--a)c.push([]);return c}.call(this),j=[];for(d=g=i=this.seriesCoords.length-1;i<=0?g<=0:g>=0;d=i<=0?++g:--g)j.push(function(){var c,e,f,g;f=this.seriesCoords[d],g=[];for(c=0,e=f.length;c<e;c++)a=f[c],a===null?b=null:b=this.r.circle(a.x,a.y,this.options.pointSize).attr("fill",this.options.lineColors[d]).attr("stroke-width",1).attr("stroke","#ffffff"),g.push(this.seriesPoints[d].push(b));return g}.call(this));return j},d.prototype.createPath=function(b,c,d,e,f){var g,h,i,j,k,l,m,n,o,p,q,r,s,t,u;o="",h=a.map(b,function(a){return a});if(this.options.smooth){j=this.gradients(h);for(k=t=0,u=h.length-1;0<=u?t<=u:t>=u;k=0<=u?++t:--t)g=h[k],k===0?o+="M"+g.x+","+g.y:(i=j[k],m=h[k-1],n=j[k-1],l=(g.x-m.x)/4,p=m.x+l,r=Math.min(e,m.y+l*n),q=g.x-l,s=Math.min(e,g.y-l*i),o+="C"+p+","+r+","+q+","+s+","+g.x+","+g.y)}else o="M"+a.map(h,function(a){return""+a.x+","+a.y}).join("L");return o},d.prototype.gradients=function(b){return a.map(b,function(a,c){return c===0?(b[1].y-a.y)/(b[1].x-a.x):c===b.length-1?(a.y-b[c-1].y)/(a.x-b[c-1].x):(b[c+1].y-b[c-1].y)/(b[c+1].x-b[c-1].x)})},d.prototype.drawHover=function(){var a,b,c,d,e;this.hoverHeight=this.options.hoverFontSize*1.5*(this.series.length+1),this.hover=this.r.rect(-10,-this.hoverHeight/2-this.options.hoverPaddingY,20,this.hoverHeight+this.options.hoverPaddingY*2,10).attr("fill",this.options.hoverFillColor).attr("stroke",this.options.hoverBorderColor).attr("stroke-width",this.options.hoverBorderWidth).attr("opacity",this.options.hoverOpacity),this.xLabel=this.r.text(0,this.options.hoverFontSize*.75-this.hoverHeight/2,"").attr("fill",this.options.hoverLabelColor).attr("font-weight","bold").attr("font-size",this.options.hoverFontSize),this.hoverSet=this.r.set(),this.hoverSet.push(this.hover),this.hoverSet.push(this.xLabel),this.yLabels=[],e=[];for(a=c=0,d=this.series.length-1;0<=d?c<=d:c>=d;a=0<=d?++c:--c)b=this.r.text(0,this.options.hoverFontSize*1.5*(a+1.5)-this.hoverHeight/2,"").attr("fill",this.options.lineColors[a]).attr("font-size",this.options.hoverFontSize),this.yLabels.push(b),e.push(this.hoverSet.push(b));return e},d.prototype.updateHover=function(b){var c,d,e,f,g,h,i=this;this.hoverSet.show(),this.xLabel.attr("text",this.columnLabels[b]);for(c=g=0,h=this.series.length-1;0<=h?g<=h:g>=h;c=0<=h?++g:--g)this.yLabels[c].attr("text",""+this.seriesLabels[c]+": "+this.yLabelFormat(this.series[c][b]));return d=Math.max.apply(null,a.map(this.yLabels,function(a){return a.getBBox().width})),d=Math.max(d,this.xLabel.getBBox().width),this.hover.attr("width",d+this.options.hoverPaddingX*2),this.hover.attr("x",-this.options.hoverPaddingX-d/2),f=Math.min.apply(null,a.map(this.series,function(a){return i.transY(a[b])})),f>this.hoverHeight+this.options.hoverPaddingY*2+this.options.hoverMargin+this.options.marginTop?f=f-this.hoverHeight/2-this.options.hoverPaddingY-this.options.hoverMargin:f=f+this.hoverHeight/2+this.options.hoverPaddingY+this.options.hoverMargin,f=Math.max(this.options.marginTop+this.hoverHeight/2+this.options.hoverPaddingY,f),f=Math.min(this.options.marginTop+this.height-this.hoverHeight/2-this.options.hoverPaddingY,f),e=Math.min(this.left+this.width-d/2-this.options.hoverPaddingX,this.columns[b]),e=Math.max(this.left+d/2+this.options.hoverPaddingX,e),this.hoverSet.attr("transform","t"+e+","+f)},d.prototype.hideHover=function(){return this.hoverSet.hide()},d.prototype.hilight=function(a){var b,c,d,e,f;if(this.prevHilight!==null&&this.prevHilight!==a)for(b=c=0,e=this.seriesPoints.length-1;0<=e?c<=e:c>=e;b=0<=e?++c:--c)this.seriesPoints[b][this.prevHilight]&&this.seriesPoints[b][this.prevHilight].animate(this.pointShrink);if(a!==null&&this.prevHilight!==a){for(b=d=0,f=this.seriesPoints.length-1;0<=f?d<=f:d>=f;b=0<=f?++d:--d)this.seriesPoints[b][a]&&this.seriesPoints[b][a].animate(this.pointGrow);this.updateHover(a)}this.prevHilight=a;if(a===null)return this.hideHover()},d.prototype.updateHilight=function(a){var b,c,d,e;a-=this.el.offset().left,e=[];for(b=c=d=this.hoverMargins.length;d<=0?c<=0:c>=0;b=d<=0?++c:--c){if(b===0||this.hoverMargins[b-1]>a){this.hilight(b);break}e.push(void 0)}return e},d.prototype.measureText=function(a,b){var c,d;return b==null&&(b=12),d=this.r.text(100,100,a).attr("font-size",b),c=d.getBBox(),d.remove(),c},d.prototype.yLabelFormat=function(a){return""+this.options.preUnits+b.commas(a)+this.options.postUnits},d}(),b.parseDate=function(a){var b,c,d,e,f,g,h,i,j,k,l;return typeof a=="number"?a:(c=a.match(/^(\d+) Q(\d)$/),e=a.match(/^(\d+)-(\d+)$/),f=a.match(/^(\d+)-(\d+)-(\d+)$/),h=a.match(/^(\d+) W(\d+)$/),i=a.match(/^(\d+)-(\d+)-(\d+)[ T](\d+):(\d+)(Z|([+-])(\d\d):?(\d\d))?$/),j=a.match(/^(\d+)-(\d+)-(\d+)[ T](\d+):(\d+):(\d+(\.\d+)?)(Z|([+-])(\d\d):?(\d\d))?$/),c?(new Date(parseInt(c[1],10),parseInt(c[2],10)*3-1,1)).getTime():e?(new Date(parseInt(e[1],10),parseInt(e[2],10)-1,1)).getTime():f?(new Date(parseInt(f[1],10),parseInt(f[2],10)-1,parseInt(f[3],10))).getTime():h?(k=new Date(parseInt(h[1],10),0,1),k.getDay()!==4&&k.setMonth(0,1+(4-k.getDay()+7)%7),k.getTime()+parseInt(h[2],10)*6048e5):i?i[6]?(g=0,i[6]!=="Z"&&(g=parseInt(i[8],10)*60+parseInt(i[9],10),i[7]==="+"&&(g=0-g)),Date.UTC(parseInt(i[1],10),parseInt(i[2],10)-1,parseInt(i[3],10),parseInt(i[4],10),parseInt(i[5],10)+g)):(new Date(parseInt(i[1],10),parseInt(i[2],10)-1,parseInt(i[3],10),parseInt(i[4],10),parseInt(i[5],10))).getTime():j?(l=parseFloat(j[6]),b=Math.floor(l),d=Math.round((l-b)*1e3),j[8]?(g=0,j[8]!=="Z"&&(g=parseInt(j[10],10)*60+parseInt(j[11],10),j[9]==="+"&&(g=0-g)),Date.UTC(parseInt(j[1],10),parseInt(j[2],10)-1,parseInt(j[3],10),parseInt(j[4],10),parseInt(j[5],10)+g,b,d)):(new Date(parseInt(j[1],10),parseInt(j[2],10)-1,parseInt(j[3],10),parseInt(j[4],10),parseInt(j[5],10),b,d)).getTime()):(new Date(parseInt(a,10),0,1)).getTime())},b.commas=function(a){var b,c,d,e;return a===null?"n/a":(d=a<0?"-":"",b=Math.abs(a),c=Math.floor(b).toFixed(0),d+=c.replace(/(?=(?:\d{3})+$)(?!^)/g,","),e=b.toString(),e.length>c.length&&(d+=e.slice(c.length)),d)},b.pad2=function(a){return(a<10?"0":"")+a},b.labelSeries=function(c,d,e,f,g){var h,i,j,k,l,m,n,o,p,q,r;j=200*(d-c)/e,i=new Date(c),n=b.LABEL_SPECS[f];if(n===void 0){r=b.AUTO_LABEL_ORDER;for(p=0,q=r.length;p<q;p++){k=r[p],m=b.LABEL_SPECS[k];if(j>=m.span){n=m;break}}}n===void 0&&(n=b.LABEL_SPECS.second),g&&(n=a.extend({},n,{fmt:g})),h=n.start(i),l=[];while((o=h.getTime())<=d)o>=c&&l.push([n.fmt(h),o]),n.incr(h);return l},c=function(a){var b,d,e;if(a==null||typeof a!="object")return a;if(a instanceof Date)return new Date(a.getTime());if(a instanceof RegExp)return b="",a.global!=null&&(b+="g"),a.ignoreCase!=null&&(b+="i"),a.multiline!=null&&(b+="m"),a.sticky!=null&&(b+="y"),new RegExp(a.source,b);e=new a.constructor;for(d in a)e[d]=c(a[d]);return e},d=function(a){return{span:a*60*1e3,start:function(a){return new Date(a.getFullYear(),a.getMonth(),a.getDate(),a.getHours())},fmt:function(a){return""+b.pad2(a.getHours())+":"+b.pad2(a.getMinutes())},incr:function(b){return b.setMinutes(b.getMinutes()+a)}}},e=function(a){return{span:a*1e3,start:function(a){return new Date(a.getFullYear(),a.getMonth(),a.getDate(),a.getHours(),a.getMinutes())},fmt:function(a){return""+b.pad2(a.getHours())+":"+b.pad2(a.getMinutes())+":"+b.pad2(a.getSeconds())},incr:function(b){return b.setSeconds(b.getSeconds()+a)}}},b.LABEL_SPECS={year:{span:1728e7,start:function(a){return new Date(a.getFullYear(),0,1)},fmt:function(a){return""+a.getFullYear()},incr:function(a){return a.setFullYear(a.getFullYear()+1)}},month:{span:24192e5,start:function(a){return new Date(a.getFullYear(),a.getMonth(),1)},fmt:function(a){return""+a.getFullYear()+"-"+b.pad2(a.getMonth()+1)},incr:function(a){return a.setMonth(a.getMonth()+1)}},day:{span:864e5,start:function(a){return new Date(a.getFullYear(),a.getMonth(),a.getDate())},fmt:function(a){return""+a.getFullYear()+"-"+b.pad2(a.getMonth()+1)+"-"+b.pad2(a.getDate())},incr:function(a){return a.setDate(a.getDate()+1)}},hour:d(60),"30min":d(30),"15min":d(15),"10min":d(10),"5min":d(5),minute:d(1),"30sec":e(30),"15sec":e(15),"10sec":e(10),"5sec":e(5),second:e(1)},b.AUTO_LABEL_ORDER=["year","month","day","hour","30min","15min","10min","5min","minute","30sec","15sec","10sec","5sec","second"],window.Morris=b}).call(this);
\ No newline at end of file
diff --git a/test/test.html b/test/test.html
index 96b8cb4..cff7f49 100644
--- a/test/test.html
+++ b/test/test.html
@@ -11,7 +11,7 @@
 
     module("Morris");
 
-    test("Input data remains untouched", function() {
+    test("Input data remains untouched", function () {
         var my_data = [{x: 1, y: 1}, {x: 2, y: 2}];
         var expected_data = [{x: 1, y: 1}, {x: 2, y: 2}];
         Morris.Line({
@@ -24,6 +24,18 @@
         deepEqual(my_data, expected_data);
     });
 
+    test("Nicer error when the placeholder was not found.", function () {
+        var my_data = [{x: 1, y: 1}, {x: 2, y: 2}];
+        raises(function() {
+            Morris.Line({
+                element: "thisplacedoesnotexist",
+                data: my_data,
+                xkey: 'x',
+                ykeys: ['y'],
+                labels: ['dontcare']})
+        }, "Graph placeholder not found.");
+    });
+
     test("Morris.commas", function () {
       // zero
       equal(Morris.commas(0), "0", "commas(0) = 0")