activateMenu = function(nav) {
	if (document.all) {
		var navroot = document.getElementById(nav);
		if (navroot != undefined && navroot.currentStyle) {
			var lis = navroot.getElementsByTagName("LI");
			for (i = 0; i < lis.length; i++) {
				/* If the LI has another menu level */
				if (lis[i].lastChild.tagName == "UL") {
					/* assign the function to the LI */
					lis[i].onmouseover = function() {
						/* display the inner menu */
						this.lastChild.style.display = "block";
					}
					lis[i].onmouseout = function() {
						this.lastChild.style.display = "none";
					}
				}
			}
		}
	}
}

window.onload = function() {
	activateMenu('menu_nav');
	activateMenu('menu_nav_vert');
}