/*
   * canvas2png.js
   *
   * Copyright (c) 2010-2013 Shinya Muramatsu
   * Released under the MIT License
   * http://flashcanvas.net/
   */
  
  (function(doc) {
  
  var scripts = doc.getElementsByTagName("script");
  var script  = scripts[scripts.length - 1];
  var url     = script.getAttribute("src").replace(/[^\/]+$/, "save.php");
  
  window.canvas2png = function(canvas, filename) {
      var tagName = canvas.tagName.toLowerCase();
      if (tagName !== "canvas") {
          return;
      }
  
      if (typeof FlashCanvas !== "undefined") {
          FlashCanvas.saveImage(canvas, filename);
      } else {
          var action = url;
          if (filename) {
              action += "?filename=" + filename;
          }
  
          var form  = doc.createElement("form");
          var input = doc.createElement("input");
  
          form.setAttribute("action", action);
          form.setAttribute("method", "post");
  
          input.setAttribute("type",  "hidden");
          input.setAttribute("name",  "dataurl");
          input.setAttribute("value", canvas.toDataURL());
  
          doc.body.appendChild(form);
          form.appendChild(input);
          form.submit();
          form.removeChild(input);
          doc.body.removeChild(form);
      }
  }
  
  })(document);