window.onloadListeners = new Array();

window.addOnLoadListener = function (listener) {
	window.onloadListeners[window.onloadListeners.length] = listener;
}

Event.observe(window, 'load', function () {
	for (var i = 0; i < window.onloadListeners.length; i++){
    window.onloadListeners[i].call();
	}
});