$(function(){
  $("#div ul li").hover(function(){
    $(this).css("background","").children("ul").slideDown();
  },function(){
    $(this).css("background","").children("ul").slideUp();
  })
  $("#div ul li ul li").hover(function(){
     $(this).css("background","Gray");
	 },function(){
	 $(this).css("background","Gary");
	 })
  })