#nav {position: relative; top: 25px; margin:0 auto; width: 647px; height: 21px; overflow:hidden;}
#nav ul {list-style: none; margin:0; padding:0;}
#nav a {display: block; text-indent: -900%; position: absolute;}
#nav a:hover {background-position: left bottom;}
#nav .home {width: 51px; height: 21px; background: url("../images/nav_home.gif") no-repeat; left:0px; top:0px;}
#nav .race-info {width: 95px; height: 21px; background: url("../images/nav_race_info.gif") no-repeat; left:84px; top:0px;}
#nav .reg {width: 136px; height: 21px; background: url("../images/nav_reg.gif") no-repeat; left: 212px; top:0;}
#nav .sponsors {width: 100px; height: 21px; background: url("../images/nav_sponsors.gif") no-repeat; left: 381px; top: 0px;}
#nav .history {width: 134px; height: 21px; background: url("../images/nav_history.gif") no-repeat; left: 513px; top: 0px;}

#nav .home-current {width: 51px; height: 21px; background: url("../images/nav_home.gif") no-repeat; background-position: left bottom; left:0px; top:0px;}
#nav .race-info-current {width: 95px; height: 21px; background: url("../images/nav_race_info.gif") no-repeat; background-position: left bottom; left:84px; top:0px;}
#nav .reg-current {width: 136px; height: 21px; background: url("../images/nav_reg.gif") no-repeat; background-position: left bottom; left: 212px; top:0;}
#nav .sponsors-current {width: 100px; height: 21px; background: url("../images/nav_sponsors.gif") no-repeat; background-position: left bottom; left: 381px; top: 0px;}
#nav .history-current {width: 134px; height: 21px; background: url("../images/nav_history.gif") no-repeat; background-position: left bottom; left: 513px; top: 0px;}