调试易

var IO=document.getElementById('shopfloat'),Y=IO,H=0,IE6;
IE6=window.ActiveXObject&&!window.XMLHttpRequest;
while(Y){H+=Y.offsetTop;Y=Y.offsetParent};
if(IE6)
    IO.style.cssText="position:absolute;top:expression(this.fix?(document"+
        ".documentElement.scrollTop-(this.javascript||"+H+")):0)";
window.onscroll=function (){
    var d=document,s=Math.max(d.documentElement.scrollTop,document.body.scrollTop);
    if(s>H&&IO.fix||s<=H&&!IO.fix)return;
    if(!IE6)IO.style.position=IO.fix?"":"fixed";        
    IO.fix=!IO.fix;
};
try{document.execCommand("BackgroundImageCache",false,true)}catch(e){};<div class="applisttop" id="shoplist">
        <div id="shopfloat">
         <ul>
          <div class="tab" style="height:10px">
       <div class="tab_menu">
    <ul>
     <li class="selected">商品说明</li>
     <li onclick="jlXMLHttp()">成交记录(123)</li>
     <li onclick="startXMLHttp()">咨询评论(12)</li>
     <li onclick="zyXMLHttp()">直邮商品提示</li>
     <li onclick="yfXMLHttp()">运费信息</li>
     <li onclick="shXMLHttp()">售后服务</li>
    </ul>
       </div>
      </div>
         </ul>
        </div>
       </div>       <div class="tab_box"> 
 <div id="goodsbox">
         </div>
 <div class="hide">
  <div id="goodsjlbox"></div>
 </div>
 <div class="hide">
  <div id="goodsplbox"></div>
 </div>
 <div class="hide">
  <div id="jinkoushop"></div>
 </div>
 <div class="hide">
  <div id="yunfei"></div>
 </div>
 <div class="hide">
  <div id="shouhou"></div>
 </div>
    </div>这段是商品浮动条+TAB选项卡 但是浮动以后，再点选项卡后，浮动条回不到原来位置，望高手指点