Enter Numbers Only



Test it here:
The box above will only allow numbers to be entered. It will reject all other characters.

Here is the javascript function:
<script>
<!--
 function numbersOnly(field, event) {
  var key, keychar;

  if (window.event)
   key=window.event.keyCode;
  else if (event)
   key=event.which;
  else
   return true;
   keychar=String.fromCharCode(key);

  if ((key==null) || (key==0) || (key==8) ||
   (key==9) || (key==13) || (key==27) )
   return true;
  else if ((("0123456789").indexOf(keychar) > -1))
   return true;
  else return false;
 }
//-->
</script>

Call the function from within an input object.
<input type="text" name="serialnumber" size="10" maxlength="10"
onkeypress="return numbersOnly(this, event)">

RETURN