用添加小图标 为何不显示图标

[wang776611]

<div class="menu">
<ul class="expmenu">
<li>
<div class="menu-single" id="topmenut01" style="display:none;">

<a href="welcome.jsp" target="mainFrame"style="color:#38a0da" >系统首页</a>

</div>
</li>


<li>

<div class="menu-exp" id="topmenut02" style= display:none;>系统性能统计</div>
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</ul>

</div>
</body>

[天际的海浪]

<img>标签的 src属性中不用写url() <img alt="" src="../images/tubiao1.png"> css中才需要写url()