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');
}