function btLogin() {

	var passcode = document.getElementById("idcode").value;
	if (passcode == "") {
		ndAlert(givePersonalCode);
		return false;
	}
	postDataReturnText("/site/ajax_login_bloedtest.php", "passcode="+passcode, btLoginCallback);
	return false;
}

function btLoginCallback(code) {
	if (code == 0) {
		ndAlert(invalidCode);
	} 
	if (code == 1) {
		top.location.href = "contentpage.php?page=bloedtest_nognietbekend";
	}
	if (code == 2) {
		top.location.href = "bloedtest_uitslag.php"; //you are logged in at this point, so just redirect
	}
}