var isDOM = (document.getElementById ? true : false);
var isIE4 = ((document.all && !isDOM) ? true : false);
var isNS4 = (document.layers ? true : false);
var isDyn = (isDOM || isIE4 || isNS4);

function getTag(id) {
	if (isDOM) return document.getElementById(id);
	if (isIE4) return document.all[id];
	if (isNS4) return document.layers[id];
}

function getTagStyle(id) {
	return (isNS4 ? getTag(id) : getTag(id).style);
}

function MenuDisplay(l_element) {
	if (navigator.appName != "Microsoft Internet Explorer") { return;}
	getTagStyle(l_element).display = 'block';
}

function MenuHide(l_element) {
	if (navigator.appName != "Microsoft Internet Explorer") { return;}
	getTagStyle(l_element).display = 'none';
}