function registerUser() {
    httpObject = getHTTPObject();
    if (httpObject != null) {
    httpObject.open("GET", "backend/register.php?action=registerUser&username=" + document.getElementById('txtUsername').value + "&password=" + document.getElementById('txtPassword').value + "&emailAddress=" + document.getElementById('txtEmail').value, true);
    httpObject.send(null);
    httpObject.onreadystatechange = handleRegistration;
    }
}

function handleRegistration() {
    if(httpObject.readyState == 4) {
    if (httpObject.responseText == '1') {
        window.location = "/register2.php";
    } else if (httpObject.responseText == '0') {
        document.getElementById('tdUsername').innerHTML = 'Registration failed.';
    } else {
        document.getElementById('tdUsername').innerHTML = 'Server error.';
    }
    }
}