$(document).ready(function() {
   $('#container_top_menu a.menu_position').mouseover(function(){
			var id=$(this).attr('id');
			var backgroundImage=$(this).css('backgroundImage');
			
			$(this).mouseout(function(){
				$(this).css({
					'backgroundImage' : backgroundImage
				})
			});
			
			//alert('../images/menu-mouse-over/'+id+'.gif');
			$(this).css({
				'backgroundImage' : 'url(images/default/menu-mouse-over/'+id+'.gif)'
			});
		});
 });