帮忙看下下面这段代码 在 firefox里不能实现的问题

<div   id= "roolDiv "     style= "overflow:hidden; "   >

<ul   id= "roolUl ">

          <li>   <a   href= "EnterpriseWeb/AboutUs.aspx?member=F00108 "   target= "_blank "   > XIAMEN   ORIENT   SOAR   INTERNATIONAL   CO.,LTD.   </a> </li>
       
          <li>   <a   href= "EnterpriseWeb/AboutUs.aspx?member=G00227 "   target= "_blank "   > HANGZHOU   YUNJIANG   TEXTILES   CO.,LTD   </a> </li>
       
          <li>   <a   href= "EnterpriseWeb/AboutUs.aspx?member=N00118 "   target= "_blank "   > NINGBO     JINMAO     IMPORT     &     EXPORT     CO.,     LTD   </a> </li>
       
          <li>   <a   href= "EnterpriseWeb/AboutUs.aspx?member=F00184 "   target= "_blank "   > JINJIANG   YUDENG   TEXTILE   CO.,LTD   </a> </li>
       
          <li>   <a   href= "EnterpriseWeb/AboutUs.aspx?member=F00120 "   target= "_blank "   > FU   DA   KNITING   INDUSTRIAL   CO.,LTD.OF   SHI   SHI   CITY   </a> </li>
       
          <li>   <a   href= "EnterpriseWeb/AboutUs.aspx?member=F00033 "   target= "_blank "   > SHISHI   HUAFEI   GARMENTS   CO.,LTD   </a> </li>
       
          <li>   <a   href= "EnterpriseWeb/AboutUs.aspx?member=G00047 "   target= "_blank "   > GUANGZHOU   XINSHENG   INDUSTRIAL   CO.,LTD.   </a> </li>
       
          <li>   <a   href= "EnterpriseWeb/AboutUs.aspx?member=G00269 "   target= "_blank "   > LANXI   HONGYUAN   CRAFTS&GIFTS   CO.,LTD   </a> </li>
       
          <li>   <a   href= "EnterpriseWeb/AboutUs.aspx?member=N00130 "   target= "_blank "   > NINGBO   AMANDA   FASHION   CO.,LTD   </a> </li>
       
          <li>   <a   href= "EnterpriseWeb/AboutUs.aspx?member=N00100 "   target= "_blank "   > NINGBO   HOLHAN   COMPANY   LIMITED   </a> </li>
       
          <li>   <a   href= "EnterpriseWeb/AboutUs.aspx?member=N00076 "   target= "_blank "   > NINGBO     JEAGLE     KNITTING     CO.,     LTD   </a> </li>
       
          <li>   <a   href= "EnterpriseWeb/AboutUs.aspx?member=L00044 "