点链接切换图片

<ul>
<li><a href="#" title="11111" onclick="link(1)">11111</a></li>   
<li><a href="#" title="22222" onclick="link(2)">22222</a></li>
<li><a href="#" title="33333" onclick="link(3)">33333</a></li>
<li><a href="#" title="44444" onclick="link(4)">44444</a></li>    
</ul>
<div id="crmhf"><img id="placeholder" style="border:1px solid #FF0000; padding:5px" title="crmhf" src="images/1.jpg"/></div>

<script language="javascript">
   function link(x)
       { document.getElementById("placeholder").src="images/"+x+".jpg" }
</script>