var HidingTimers = {};
  function additional_drop(par, ns, open, rover) {
	  if (open) {
		  clearTimeout(HidingTimers[ns]);
		  var pheight = $(par).height()
		  
		  $('.additional_dropdown').each(function(index) {				
			  if (this.id == ns) {				  
				  $(this).slideDown()
			  } else {
				  $(this).stop(true, true).hide()
			  }
		  })
		
		  var coords_md = $('#mainDiv').offset()
		  var coords_par = $(par).offset()
		  $('#' + ns).css({
			  
			  position: 'absolute',
			  zIndex: 5000,
			  left: coords_par.left + 'px',
			  top: '161px'
		  });
	  } else {
		  HidingTimers[ns] = setTimeout(function(){ additional_hide(ns); }, 0)
	  }
  }

	$(function(){
	
  		$('.additional_dropdown').bind("mouseenter", function() { 
			clearTimeout(HidingTimers[this.id]); 
			$('#additional_parent').css("background-color", "#000");
		});
		$('.additional_dropdown').bind("mouseleave", function() { 
			var dd = this;
			HidingTimers[this.id] = setTimeout(function(){ additional_hide(dd.id); }, 500);
			$('#additional_parent').css("background", "none");
		});
	})

	function additional_hide(ns, par) {
		$('#' + ns).stop(true, true).slideUp("fast")
	}