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