function loginViaSite(loginurl) {
	var LOGINURL	= "/index.php?"; // Where do we have to send the data? e.a http://mysite.com/handleLogin.php

	if(loginurl)
		LOGINURL = loginurl;
	
	var email = document.getElementById('loginEmail').value;
	var postcode = document.getElementById('loginPostcode').value;
	
	if(checkMailAddress(email) && postcode != '') {
		var login = "action=login&loginEmail=" + email + "&loginPassword=" + postcode;
		parent.location.href = LOGINURL + login;	
	} else {
		alert("Sie mussen eine korrekte E-Mail-Adresse und / oder Postleitzahl ubertragen");
	}
}

function checkMailAddress(email) {
	if(email == '' || email == ' ') {
		return false;
	} else {
		if(email.indexOf("@") > 0 && email.indexOf(".") > 0){
			return true;
		}
		else {
			return false;
		}
	}
}