$(document).ready(function(){

	var active     = '';
	var currentSub = $('ul.sub_nav_current').attr('id');

	$('ul#nav li')
	.hover(
		function(){
			var currentId  = $(this).attr('id'); 
			$('#' + currentSub).hide();

			if (active != currentId) 
			{
				if (active != '') {
					$('#menu ul#sub-' + active).hide();
				}
				active = currentId;


			}
			$('ul#sub-' + currentId).show();
		},
		function(){
			// doe niets
		}
	);
   
	$('#menu')
	.hover(
		function(){
			// var currentId = $(this).attr('id'); 
		},
		function(){
			if (active != '') {
				$('ul#sub-' + active).hide();
				active = '';
			}
			$('#' + currentSub).show();
		}
	);
});