javascript更换单元格背景图

<table width="100%" border="0" cellspacing="0" cellpadding="0">
     <script language="javascript">
function bianhuan(name,id1,id3)
{
   if(name="{F3EE4F5B-79AE-4881-B46C-02.gif")
   {
      document.all[id1].style.background='D:/网站/images/{00A97912-0F11-4252-B2D5-9F.gif'
   }
   //alert(name);
}

</script>  
 
  <tr>
        <td id="one" width="515" height="231" rowspan="2" valign="top" background="images/{F3EE4F5B-79AE-4881-B46C-5A.gif">&nbsp;</td>
        <td  id="two" width="234" height="116" background="images/{F3EE4F5B-79AE-4881-B46C-02.gif" onMouseOver="bianhuan('{F3EE4F5B-79AE-4881-B46C-02.gif','one','three')">&nbsp;</td>
      </tr>
      <tr>
        <td id="three" width="234" height="115" background="images/{F3EE4F5B-79AE-4881-B46C-03.gif">&nbsp;</td>
      </tr>
    </table>这是个onmouseover事件,当鼠标放上去后id=one的单元格的背景图片怎么换不了.变成了空白.请各位高手看帮忙看看.