How to get Value of a variable outside the Html2Canvas

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Javascript

HTML

jQuery

Canvas

Iam using Html2Canvas.js for converting a div into canvas

var canvasimage=""; 
 html2canvas($("#dvorder"), {
                onrendered: function (canvas) {
                    theCanvas = canvas;
                    $('#imgDemo').append(canvas);
                    $('#imgDemo canvas').attr('id', 'Billcan');                   
                    canvasimage = document.getElementById('Billcan').toDataURL("image/png");                   
                  
                }
                
            });

How to get the value of variable canvasimage outside the html2Canvas
refer:http://jsfiddle.net/8ypxW/3/[^]