#nav li a {
	height:0;
	overflow:hidden;
	padding-top:70px;
	background:url(/g/penn.west/nav.jpg);
	display:block;
}

#nav .abo {width:252px;background-position:0 0;}
#nav .pho {width:169px;background-position:-252px 0;}
#nav .hom {width:156px;background-position:-421px 0;}
#nav .ret {width:161px;background-position:-577px 0;}

#nav .abo:hover {width:252px;background-position:0 			70px;}
#nav .pho:hover {width:169px;background-position:-252px 70px;}
#nav .hom:hover {width:156px;background-position:-421px 70px;}
#nav .ret:hover {width:161px;background-position:-577px 70px;}