var selectedSpan = null;
 function highlight(spanObject,menuClass)
    {    
         spanObject.className = menuClass;
    }
 function rollon(spanObject,menuClass)
    {
         spanObject.className = menuClass;
    }
    
 function rolloff(spanObject,menuClass)
    {
         if (spanObject != selectedSpan)
              spanObject.className = menuClass;
    }