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<html>
<head>
<title></title>
<link rel="stylesheet" href="jquery.css" type="text/css" media="screen"/>
<script src="jquery.js" type="text/javascript">
$(document).ready(function(){
$('#selected-plays > li').addClass('horizontal');
});
</script>
</head>
<body>
<ul id="selected-plays">
<!--Comedies-->
<li>Comedies
<ul>
<li>walkman</li>
<li>sony</li>
</ul>
</li>
<!--Tragedies-->
<li>Tragedies
<ul>
<li>romio</li>
<li>julie</li>
</ul>
</li>
<!--Histories-->
<li>Histories
<ul>
<li>Part I</li>
<li>Part II</li>
</ul>
</li>
</ul>
</body>
</html>
.horizontal {
float: left;
list-style: none;
margin: 10px;
}
<script src="jquery.js" type="text/javascript">
$(document).ready(function(){
$('#selected-plays > li').addClass('horizontal');
});
</script>