$(document).ready(function(){
	$('.dropdownmenu').each(function () {		
		$(this).attr('hhh', $(this).height());		
	});		
	$('.dropdownmenu').hide().height(0);
    $('.dropdown-menu').hover(
      function () {
        $('.menu_tab', this).addClass('active_tab'); 	
        $('.dropdownmenu', this).stop().show().animate({height:$('.dropdownmenu', this).attr('hhh')}, 110);
      }, 
      function () {
        obj = this;	  
		$('.menu_tab', obj).removeClass('active_tab');
	   	$('.dropdownmenu', this).stop().animate({height:0}, 110, function(){$('.dropdownmenu').hide(); });
      }
    );
});