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"); 
}