menuHover = function(nav) {
   var sfEls = document.getElementById(nav).getElementsByTagName("li");
   for (var i=0; i<sfEls.length; i++) {
     sfEls[i].onmouseover=function() {
       this.className+=" sfhover";
     }
     sfEls[i].onmouseout=function() {
       this.className=this.className.replace(new RegExp("\\s?sfhover\\b"), "");
     }
   }

   var listItem = document.getElementById(nav).getElementsByTagName('ul');
   for(var i=0;i<listItem.length;i++) {
     listItem[i].onmouseover=function() {
       var changeStyle = this.parentNode.getElementsByTagName('a');
       changeStyle[0].className+=" active";
     }

     listItem[i].onmouseout=function() {
       var changeStyle = this.parentNode.getElementsByTagName('a');
       changeStyle[0].className=this.className.replace(new RegExp("\\s?active\\b"), "");
     }
   }
 }

 function addEvent( obj, type, fn ) {
   if ( obj.attachEvent ) {
     obj['e'+type+fn] = fn;
     obj[type+fn] = function(){obj['e'+type+fn]( window.event );}
     obj.attachEvent( 'on'+type, obj[type+fn] );
   } else
     obj.addEventListener( type, fn, false );
   }
 function removeEvent( obj, type, fn ) {
   if ( obj.detachEvent ) {
   obj.detachEvent( 'on'+type, obj[type+fn] );
   obj[type+fn] = null;
   } else
     obj.removeEventListener( type, fn, false );
   }

 addEvent(window, 'load', function () { menuHover('menu'); });