var globalNavRoot;
function globalTopNav() {
     if (document.getElementById) {
          globalNavRoot = document.getElementById('avnv');
		  var allLi = document.getElementById('avnv').getElementsByTagName('LI').length;
          for (i=0; i<globalNavRoot.childNodes.length; i++) {
               node = globalNavRoot.childNodes[i];
               if (node.nodeName=='LI') {
                    node.onmouseover=function() {
                         this.className+=' displayBlock';
                    }
                    node.onmouseout=function() {
						 this.className=this.className.replace(" displayBlock", ""); 
                    }
			   }
          }
     }
}
window.onload=globalTopNav;