$(function(){
 var categories=j$(".widget");
 j$("ul.children",categories).hide();
 j$("li",categories).each(function(){
   if(j$(this).children("ul.children").length>0){
   j$(this).children("a").click(function(){
   j$(this).siblings("ul.children").toggle("fast");
   return false;
   });
  }
 });
});