<script src='side-content.js'></script>
</body>

<ul id='sider'>

	</ul>

<div id='side-content'>
	<div id="side-1">你</div>
	<div id="side-2">是</div>
	//你想添加的标题 -- 前缀必须是 side-
</div>

var a = setSider('side-content'); //setSider('主内容ID');

//or

var a = setSider(); //默认 side-content