$(document).ready( function() {

  var trackId = "";
  var timeOpen = "";
  var timeClose = ""; 
  
  $ec('#new_cars li')
    .mouseenter(function(){
      var ele = this; 
      if(trackId == $(ele).attr('id')){
        clearTimeout(timeOpen);
      }else{
        trackId = $(ele).attr('id');
      }

      timeOpen = setTimeout(function(){
        $(ele).stop().animate({opacity: 1})
        $(ele).siblings().stop().animate({opacity: 0.5});
        $(ele).children('ul').slideDown('slow');
      }, 100);  
    })
    .mouseleave(function(){
      var ele = this;
      if(trackId == $(ele).attr('id')){
        clearTimeout(timeClose);
      }else{
        trackId = $(ele).attr('id');
      }
      timeClose = setTimeout(function(){
        $(ele).siblings().stop().animate({opacity: 1});
        $(ele).children('ul').slideUp('slow');
      }, 100);  
    });
});