I'm trying to capture a div into an image using html2canvas

I have read some similar question here like

How to upload a screenshot using html2canvas?

create screenshot of web page using html2canvas (unable to initialize properly)

I have tried the code

canvasRecord = $('#div').html2canvas(); 
dataURL = canvasRecord.toDataURL("image/png");

and the canvasRecord will be undefined after .html2canvas() called

and also this

$('#div').html2canvas({
      onrendered: function (canvas) {
           var img = canvas.toDataURL()
           window.open(img);
      } 
});

browser gives some (48 to be exact) similar errors like:

GET http://html2canvas.appspot.com/?url=https%3A%2F%2Fmts1.googleapis.com%2Fvt%…%26z%3D12%26s%3DGalileo%26style%3Dapi%257Csmartmaps&callback=html2canvas_1 404 (Not Found)

BTW, I'm using v0.34 and I have added the reference file html2canvas.min.js and jquery.plugin.html2canvas.js

How can I convert the div into canvas in order to capture the image.

EDIT on 26/Mar/2013

I found Joel's example works.

But unfortunately when Google map embedded in my app, there will be errors.

<html>
<head>
<style type="text/css">
div#testdiv
{
    height:200px;
    width:200px;
    background:#222;
}
div#map_canvas
{
    height: 500px;
    width: 800px;
    position: absolute !important;
    left: 500px;
    top: 0;
}
</style>
 <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?v=3&sensor=false"></script>
<scrip
javascript html html2canvas
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