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<form >  <table border="0" cellspacing="5" cellpadding="5" align="center">
    <tr>
      <td>
        <div align="center">
          <select multiple  size=8 >
            <option value="A">a</option>
            <option value="B">b</option>
            <option value="C">c</option>
            <option value="D">d</option>
            <option value="E">e</option>
            <option value="F">f</option>
            <option value="G">g</option>
            <option value="H">h</option>
          </select>
        </div>
      </td>
      <td>
        <div align="center">
          <input type=button value="Ìí¼Ó>>" this.form.list2);" disabled>
          <br>
          <input type=button value="ÒƳý<<" disabled>
        </div>
      </td>
      <td>
        <div align="center">
          <select multiple  size=8 >
          </select>
        </div>
      </td>
    </tr>
  </table>
</form>

<script language="JavaScript">
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function seladdchk()
{
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}

function selsubchk()
{
 document.all.sub.disabled=false
}

function MoveToRight(e1, e2)
{
 var e = e1.options
 var o2 = e2.options
 var msg
 msg=''

 for(i=e.length-1;i>=0;i--)
 {
  if(e[i].selected)
  {
   for (j=o2.length-1;j>=0;j--)
   {
    if(e[i].text == o2[j].text && e[i].value == o2[j].value)
    {
     msg=msg+e[i].text;
    }   
   }
   
   if (msg=='')
   { 
    e2.options.add(new Option(e[i].text, e[i].value));
   }
   else
   {
    alert(msg+'ÒѾ­Ñ¡Ôñ!');
    return false;
   }
  }  
 }
}

function Remove(e2)
{
 var e = e2.options
 for(i=e.length-1;i>=0;i--)
 {
  if(e[i].selected)
  {
   e2.options.remove(i);
   document.all.sub.disabled=true;
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 } 
}
//-->
</script>