$(document).ready(function(){
    $('.down-list').width($('.dropdown-menu').width()-2);	
	$('.dropdown-menu').click(
      function () {
	  		$('.menu-first', this).addClass('slide-down'); 
			$('.down-list', this).slideDown(450);
	  }
	);	  
	$('.dropdown-menu').hover(
      function () {
      }, 
      function () {
        obj = this;
        $('.down-list', this).slideUp(450, function(){ $('.menu-first', obj).removeClass('slide-down'); });
      }
    );
});