divhover=function(div,css){
 var ulBox = $(div);  
 var list = ulBox.getElementsByTagName("div");  
 for (var i=0; i<list.length; i++) {  
  list[i].onmouseover=function() {  
   this.className=css;  
  }  
  list[i].onmouseout=function() {  
   this.className="";  
  }  
 }  
}