sounds_demo/js/init.js

/*
 * This code searches for all the <script type="application/processing" target="canvasid">
 * in your page and loads each script in the target canvas with the proper id.
 * It is useful to smooth the process of adding Processing code in your page and starting
 * the Processing.js engine.
 */

if ( window.addEventListener ) {
  window.addEventListener("load", function() {
    var scripts = document.getElementsByTagName("script");
 
    for ( var i = 0; i < scripts.length; i++ ) {
      if ( scripts[i].type == "application/processing" ) {
        var src = scripts[i].getAttribute("target");
        var canvas = scripts[i].nextSibling;
 
        if ( src && src.indexOf("#") > -1 ) {
          canvas = document.getElementById( src.substr( src.indexOf("#") + 1 ) );
        } else {
          while ( canvas && canvas.nodeName.toUpperCase() != "CANVAS" ) {
            canvas = canvas.nextSibling;
          }
        }
 
        if ( canvas ) {
          new Processing(canvas, scripts[i].text);
        }
      }
    }
  }, false);
}