title: toDataURL not working on android browsers
body: <p>I have an image that the user drew on a canvas and i want to save that image on the server.</p>
  
  <p>These lines work well on my ipad but not on my android(ver 2.3.3) browser:</p>
  
  <pre><code>var testCanvas = document.getElementById("sketchpad");  
  var canvasData = testCanvas.toDataURL("image/png");
  </code></pre>
  
  <p>If i alert canvasData i only get:</p>
  
  <blockquote>
    <p>data:,</p>
  </blockquote>
  
  <p>Am I missing something? Is it possible to do on android or should i be looking at other methods, plugins, etc?</p>