#nav { padding:0; margin:0 auto; list-style-type:none; width:512px; height:26px; position:relative; z-index:500; }
#nav li.top { display:block; float:left; height:26px; }

#nav li:hover { position:relative; z-index:200; }

#nav ul, 
#nav li:hover ul ul,
#nav li:hover li:hover ul ul,
#nav li:hover li:hover li:hover ul ul,
#nav li:hover li:hover li:hover li:hover ul ul
{position:absolute; left:-9999px; top:-9999px; width:0; height:0; margin:0; padding:0; list-style:none;}

#nav a.home { display: block; width:108px; height:26px; text-decoration:none; background: transparent url(images/nav/home.gif) no-repeat; text-indent: -9999px; }
#nav a.home:hover { background-position:-108px 0; }

#nav a.about { display: block; width:65px; height:26px; text-decoration:none; background: transparent url(images/nav/about.gif) no-repeat; text-indent: -9999px; }
#nav a.about:hover { background-position:-65px 0; }

#nav a.winners { display: block; width:105px; height:26px; text-decoration:none; background: transparent url(images/nav/winners.gif) no-repeat; text-indent: -9999px; }
#nav a.winners:hover { background-position:-105px 0; }

#nav a.sponsors { display: block; width:83px; height:26px; text-decoration:none; background: transparent url(images/nav/sponsors.gif) no-repeat; text-indent: -9999px; }
#nav a.sponsors:hover { background-position:-83px 0; }

#nav a.contact { display: block; width:131px; height:26px; text-decoration:none; background: transparent url(images/nav/contact.gif) no-repeat; text-indent: -9999px; }
#nav a.contact:hover { background-position:-131px 0; }