<style type="text/css">
.a{height: 200px; width:800px; overflow: hidden; margin:10px auto;}
.a li{height: 198px; width: 198px; border:1px solid #ddd; line-height: 2.4; font-size: 30px; text-align: center; float: left;}
</style>

<div class="a" id="a1">
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
<li>9</li>
<li>10</li>
<li>11</li>
<li>12</li>
</ul>
</div>

<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="scrollForever.js"></script>
<script type="text/javascript">
$(function(){
$("#a1").scrollForever();
})
</script>