var $j = jQuery;
$j(function(){
 $j(".acc").each(function(){
  $j("li > div", this).each(function(index){
   var $this = $j(this);
   if(index >= 0) $this.next().hide();
   $this.click(function(){
    var params = {height:"toggle"};
    $j(this).next().animate(params).parent().siblings()
         .children("ul:visible").animate(params);
    return false;
   });
  });
 });
});