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