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.id="hover";
            }
            lis[i].onmouseout=function() {   
				this.id="";
            }
           /* If the LI has another menu level */
            if(lis[i].lastChild.tagName=="UL"){
                /* assign the function to the LI */
             	lis[i].onmouseover=function() {	
                   this.lastChild.style.display="block";
				   this.id="hover";
                }
                lis[i].onmouseout=function() {   
                   this.lastChild.style.display="none";
				   this.id="";
                }
            }
        }
    }
}
document.getElementsByClassName = function (needle)
{
    var s = [document.documentElement || document.body], i = 0, r = [], l = 0, e;
    var re = new RegExp('(^|\\s)' + needle + '(\\s|$)');

    do
    {
        e = s[i];

        while (e)
        {
            if (e.nodeType == 1)
            {
                if (e.className && re.test(e.className)) r[l++] = e;

                s[i++] = e.firstChild;
            }

            e = e.nextSibling;
        }
    }
    while (i--);

    return r;
}
window.onload= function(){
    /* pass the function the id of the top level UL */
    activateMenu('vertnav'); 
}