html select onchangeʼþ

<select name="CluefromType" id="CluefromType" style="width: 182px" onchange="return CluefromOtherTypeSelected();">
       <option value="Êг¡×ß·Ã">
        Êг¡×ß·Ã
       </option>
       <option value="¹¤³§×ß·Ã">
        ¹¤³§×ß·Ã
       </option>
       <option value="Õ¹»á">
        Õ¹»á
       </option>
       <option value="ÏßÈË">
        ÏßÈË
       </option>
       <option value="µ÷²é¹«Ë¾">
        µ÷²é¹«Ë¾
       </option>
       <option value="ÆäËû">
        ÆäËû
       </option>
      </select>
  function CluefromOtherTypeSelected(){
                  if   (document.all["CluefromType"].selectedIndex   ==  "5")   {
                     document.getElementById("CluefromOtherType").style.display="";  
                  }
                   if   (document.all["Clue