function SForm_Validator(theForm)
{
  var checkOK = "0123456789";
  var checkStr = theForm.fPreis.value;
  var allValid = true;
  var decPoints = 0;
  var allNum = "";
  for (i = 0;  i < checkStr.length;  i++) {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkOK.length;  j++)
      if (ch == checkOK.charAt(j))
        break;
    if (j == checkOK.length) {
      allValid = false;
      break;
    }
    allNum += ch;
  }
  if (!allValid) {
    alert("Geben Sie nur Ziffern in das Feld \"Preis\" ein.");
    theForm.fPreis.focus();
    theForm.fPreis.value = "";
    return (false);
  }
  return (true);
}

function FormFieldReset(feld) {
    feld.value = "";
    feld.select();
    feld.focus();
}