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

function ge (id) {
	if (!document.getElementById(id)) { return null; }
	return document.getElementById(id);
}

function basehref () {
	return document.getElementsByTagName('base')[0].href;
}


//change the opacity for different browsers
function changeOpacity (obj, opacity) {
    obj.opacity = (opacity / 100);
    obj.MozOpacity = (opacity / 100);
    obj.KhtmlOpacity = (opacity / 100);
    obj.filter = "alpha(opacity=" + opacity + ")";
}