Object.extend(Event, {
  _domReady : function() {
	if (arguments.callee.done) return;
	arguments.callee.done = true;

	if (this._timer)  clearInterval(this._timer);
	
	this._readyCallbacks.each(function(f) { f() });
	this._readyCallbacks = null;
},
  onDOMReady : function(f) {
	if (!this._readyCallbacks) {
	  var domReady = this._domReady.bind(this);
	  
	  if (document.addEventListener)
		document.addEventListener("DOMContentLoaded", domReady, false);
		
		/*@cc_on @*/
		/*@if (@_win32)
			document.write("<script id=__ie_onload defer src=javascript:void(0)><\/script>");
			document.getElementById("__ie_onload").onreadystatechange = function() {
				if (this.readyState == "complete") domReady(); 
			};
		/*@end @*/
		
		if (/WebKit/i.test(navigator.userAgent)) { 
		  this._timer = setInterval(function() {
			if (/loaded|complete/.test(document.readyState)) domReady(); 
		  }, 10);
		}
		
		Event.observe(window, 'load', domReady);
		Event._readyCallbacks =  [];
	}
	Event._readyCallbacks.push(f);
  }
});