function ValidateForm(frm) {
  var blnValidateOK = false
  if (frm.id == 'KlantNummerForm') {
    if (frm.klantnummer.value != "" && frm.postcode.value != "") { 
      blnValidateOK = true;
    }
  } else { // form = KlantenInfoForm
    if (frm.voorletter.value != "" && frm.naam.value != "" && frm.straat.value != "" && frm.postcode.value != "" && frm.plaats.value != "" && frm.emailadres.value != "") {
      blnValidateOK = true;
    }
  }
  if (blnValidateOK) {
    frm.submit();
  } else {
    alert("Gaarne alle velden in dit formulier invullen.\nEerder kunt u de bestelling niet plaatsen");
  }
}

function popImage(imageUrl) {
  var pictureWindow = window.open('popupPicture.asp?fileName=' + imageUrl, 'pictureWindow', 'width=200,height=100,scrollbars=0');
}

function popInfo(articleNumber) {
  var infoWindow = window.open('popupInfo.asp?artnr=' + articleNumber, 'infoWindow', 'width=560,height=400,scrollbars=yes');
}