/* --- check nummers tijdens ingave van het veld -- */

function CalcKeyCode(aChar) {
  var character = aChar.substring(0,1);
  var code = aChar.charCodeAt(0);
  return code;
}

function checkNumber(val) {
  var strPass = val.value;
  var strLength = strPass.length;
  var lchar = val.value.charAt((strLength) - 1);
  var cCode = CalcKeyCode(lchar);

  /* Check if the keyed in character is a number
     do you want alphabetic UPPERCASE only ?
     or lower case only just check their respective
     codes and replace the 48 and 57 */

  /* vervangen van een '.' door een ',' */
  if (cCode == 46) {
    var myDecNumber = val.value.substring(0, (strLength) - 1) + ',';
    cCode = 44;
    val.value = myDecNumber;
  }
  if (((cCode < 48 || cCode > 57 )) && (cCode != 44) && (cCode != 45)) {
    var myNumber = val.value.substring(0, (strLength) - 1);
    val.value = myNumber;
  }
  return false;
}


/* Voorbeeld :
<form name="myForm" method="post" action="#">
  Enter een bedrag hier: <input name="edtNr" type="text" id="txtNumber" onKeyUp="javascript:checkNumber(myForm.edtNr);">
</form>
*/