function addLoadEvent(func) {   
	var oldonload = window.onload;   
	if (typeof window.onload != 'function') {   
		window.onload = func;   
	} else {   
		window.onload = function() {   
			if (oldonload) {   
				oldonload();   
			}   
			func();   
		}   
	}   
}