function validate(event) {
    event.preventDefault();
    var form = document.forms["login"];
    var userName = form.username.value;
    var password = form.password.value;

    var data = {
        username: "",
        password: ""
    };
    data.username = userName;
    data.password = password;
    var xmlhttp = new XMLHttpRequest();
    document.getElementById("error").innerHTML = "";
    xmlhttp.onreadystatechange = function () {
        console.info(xmlhttp.status + " " + xmlhttp.responseText);
        if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
            window.location.href = "../src/homePage.php";
            return;
        } else if (xmlhttp.readyState == 4 && xmlhttp.status == 202) {
            window.location.href = "../src/homePageAdmin.php";
        } else if (xmlhttp.readyState == 4 && xmlhttp.status == 401) {
            document.getElementById("error").innerHTML = xmlhttp.responseText;
            return;
        } else if (xmlhttp.readyState == 4 && xmlhttp.status == 404) {
            document.getElementById("error").innerHTML = xmlhttp.responseText;
            return;
        }
    }
    xmlhttp.open("POST", "loginValidation.php", true);
    xmlhttp.setRequestHeader("Content-Type", "application/json");
    xmlhttp.send(JSON.stringify(data));
}