function addLoadHandler(handler) {
    
	if (window.addEventListener) {
		window.addEventListener("load", handler, false);
	} else if (window.attachEvent) {
		window.attachEvent("onload", handler);
	} else if(window.onload) {
		var oldHandler = window.onload;
		window.onload = function piggyback() {
			oldHandler();
			handler();
		};
	} else {
		window.onload = handler;
	}
}