/*global window, $, BlobBuilder, document, XMLHttpRequest */
/*jslint onevar: false, white: false */

function makePNG(pngData)
{
  var BlobBuilder = window.BlobBuilder || window.MozBlobBuilder || 
                    window.WebKitBlobBuilder;

  var blob = new BlobBuilder();
  blob.append(pngData);
  var url = blob.getBlob('image/png').createObjectURL();
  return url;
}