i have the code if i press down button it goes to next textfield but to go to previous textfield what should be the code ...
<html>
<head>
<script language="JavaScript">
function handleKeyDownEvent(elementRef,eventRef)
{ 
 var charCode = (window.event) ? eventRef.keyCode : eventRef.which;
 //alert(charCode);
 // Arrow keys (37:left, 38:up, 39:right, 40:down)...
if (charCode == 40)
 {
  if (window.event)
   window.event.keyCode = 9;
  else
   event.which = 9;
  return true;
 } 
 return true;
}
</script>
</head>
<body>
<table width="433" border="1" cellspacing="0" cellpadding="0">
        <tr>
                <td width="235" align="center"><input type="text" onKeyDown="handleKeyDownEvent(this,event);" onKeyUp="handleKeyUpEvent(this,event);"></td>
                <td width="235"  align="center"><input type="text" onKeyDown="handleKeyDownEvent(this,event);" onKeyUp="handleKeyUpEvent(this,event);"></td>
        </tr>
        <tr>
                <td width="235"  align="center"><input type="text" onKeyDown="handleKeyDownEvent(this,event);" onKeyUp="handleKeyUpEvent(this,event);"></td>
                <td width="235"  align="center"><input type="text" onKeyDown="handleKeyDownEvent(this,event);" onKeyUp="handleKeyUpEvent(this,event);"></td>
        </tr>
        <tr>
        <td>
        <input type="radio" id="check" name="check" checked>
        </td>
        <td>
        <input type="radio" id="check" name="check" checked>
        </td>
        </tr>
        <tr>
          <td><input type="checkbox" id="check" name="check"></td>
          <td><input type="checkbox" id="check" name="check"></td>
      </tr>
</table>
</body>
</html>