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Use this script to prevent users from entering characters which are not numbers.

Label: number, restriction, prevent, character,

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<script type="text/javascript">
<!--
// Copyright 1999 Idocs, Inc. http://www.idocs.com

function numbersonly(myfield, e, dec) {
  var key;
  var keychar;

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

  // control keys
  if ((key==null) || (key==0) || (key==8) || (key==9) || (key==13) || (key==27) )
    return true;

  // numbers
  else if ((("0123456789").indexOf(keychar) > -1))
    return true;

  // decimal point jump
  else if (dec && (keychar == ".")) {
    myfield.form.elements[dec].focus();
    return false;
  } else
    return false;
}
//-->
</script>

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<form>
  U.S. Zip Code: <input name="dollar" size="5" maxlength="5" onkeypress="return numbersonly(this, event)">
  <input value="Submit" type="button">
</form>