activateMenu = function(nav) {

	/* currentStyle restricts the Javascript to IE only */
	if (document.all && document.getElementById(nav).currentStyle) {

		var navroot = document.getElementById(nav);

		/* Get all the list items within the menu */
		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(){
	/* pass the function the id of the top level UL */
	/* remove one, when only using one menu */
	/*activateMenu('nav');*/
	activateMenu('vertnav');
	activateMenu('topMenu');
}