I made a small function whose work to do add class in <li> when we clicks on <li>, but I want to remove that if it is already had with <li>.
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<meta name="generator" content="CoffeeCup HTML Editor (www.coffeecup.com)">
<meta name="created" content="Tue, 22 May 2012 12:39:23 GMT">
<meta name="description" content="">
<meta name="keywords" content="">
<title></title>
<style type="text/css">
<!--
body {
color:#000000;
background-color:#FFFFFF;
}
a { color:#0000FF; }
a:visited { color:#800080; }
a:hover { color:#008000; }
a:active { color:#FF0000; }
-->
</style>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.7.2.min.js"></script>
<script type="text/javascript">
$(function(){
$('.main').find('li').each(function(){
$(this).live('click', function (){
$(this).addClass('active')
})
})
})
</script>
</head>
<body>
<ul class="main">
<li>first</li>
<li>second</li>
<li>third</li>
<li>fourth</li>
</ul>
</body>
</html>