jquery.revealer
Simple jQuery plugin to show / hide content
Sample Usage:
$('#header .revealerMenu').revealer({'clickable': 'ul.menu', 'content': 'div.sub',
'transition': 'fade', 'duration': 300, 'action' : 'mouseenter' , 'easing' : 'easeOutQuart', 'perform' : 'open'
});