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js怎样实现下拉框改变，它旁边的图像也改变

<select id="s1" onchange='document.getElementById("pic").src=this.value'> 
<option value="/upload/20080918164946929.gif">biggrin</option> 
<option value="/upload/20080918164946913.gif">confused</option> 
<option value="/upload/20080918164946995.gif">cool</option> 
<option value="/upload/20080918164946667.gif">eek</option> 
<option value="/upload/20080918164946725.gif">frown</option> 
<option value="/upload/20080918164946792.gif">han</option> 
<option value="/upload/20080918164946356.gif">mad</option> 
<option value="/upload/20080918164946762.gif">redface</option> 
<option value="/upload/20080918164946633.gif">rolleyes</option> 
<option value="/upload/20080918164946854.gif">smile</option> 
<option value="/upload/20080918164947307.gif">tongue</option> 
<option value="/upload/20080918164947238.gif">wink</option> 
</select> 
<img id="pic" src="http://files.glzy8.com/upload/20080918164946929.gif" _ewebeditor_ta_src="http%3A%2F%2Ffiles.glzy8.com%2Fupload%2F20080918164946929.gif" border="0" width="15">

　　 [Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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