$(document).ready(
				function(){					
					$('.myMenu > li').bind('mouseover', openSubMenu); 
					$('.myMenu > li').bind('mouseout', closeSubMenu); 
					
					function openSubMenu() { $(this).find('ul').css('visibility', 'visible'); }; 
					function closeSubMenu() { $(this).find('ul').css('visibility', 'hidden'); };
					
			});