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++) {
        
			lis[i].onmouseover=function() {	
					
					this.className += " over";
					
                   /* display the inner menu */
                   	if(this.lastChild.tagName == "UL") {
						this.lastChild.style.display="block";
				   	}
					
					
					
 
            }
            lis[i].onmouseout=function() {                       
				   
				   	this.className = this.className.replace(" over", "");
				   
				   	if(this.lastChild.tagName == "UL") {
                   	   	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'); 
}