function validationAlert(strAlert, hField) {
	// Displays an alert, focuses a form field, and returns false.
	alert(strAlert);
	try { hField.focus(); } catch(ex) {}
	return false;
}

function validateSelectbox(hSelectbox, strAlert) {
	if (hSelectbox.value.length == 0) {
		return validationAlert(strAlert, hSelectbox);
	}
	return true;
}