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);
	}
});