Untitled

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Untitled Document</title>
<script src="jquery.js" type="text/javascript"></script>
<script type="text/javascript">
jQuery(document).ready(function(){
	jQuery("#nav a").click(function(){
		jQuery("#nav a").removeClass("active");
		jQuery(this).addClass("active");
	});
});
</script>
</head>
<body>
<div id="nav">
<a href="#">one</a>
<a href="#">two</a>
<a href="#">three</a>
</div>
</body>
</html>