function checkInput(id) {
            document.getElementById(id + "IMG").setAttribute("class", "output");
            document.getElementById(id + "IMG").setAttribute("src", "/img/loader.gif");

            if (id == "username") {
                var unInp = document.getElementById(id).value;
                if (unInp.length > 4) {
                    $.get("/inc/validator.php", { check: "true", type: "username", value: unInp },
                            function(data) {
                                if (data == "0") {
                                    document.getElementById(id + 'IMG').src = "/img/tick.png";
                                } else {
                                    document.getElementById(id + 'IMG').src = "/img/cross.png";
                                }
                            });

                } else {
                    document.getElementById(id + 'IMG').src = "/img/cross.png";
                }
            }
            
            if (id == "email") {
                var emInp = document.getElementById(id).value;
                if (emInp.length > 6) {
                    $.get("/inc/validator.php", { check: "true", type: "email", value: emInp },
                            function(data) {
                                if (data == "0") {
                                    document.getElementById(id + 'IMG').src = "/img/tick.png";
                                } else {
                                    document.getElementById(id + 'IMG').src = "/img/cross.png";
                                }
                            });

                } else {
                    document.getElementById(id + 'IMG').src = "/img/cross.png";
                }
            }
            
            if (id == "password") {
                var pwInp = document.getElementById(id).value;
                if (pwInp.length > 4) {
                    document.getElementById(id + 'IMG').src = "/img/tick.png";
                } else {
                    document.getElementById(id + 'IMG').src = "/img/cross.png";
                }
            }

            if (id == "password2") {
                var pwInp1 = document.getElementById('password').value;
                var pwInp2 = document.getElementById(id).value;
                if (pwInp2.length > 4) {
                    if (pwInp1 == pwInp2) {
                        document.getElementById(id + 'IMG').src = "/img/tick.png";
                    } else {
                        document.getElementById(id + 'IMG').src = "/img/cross.png";
                    }
                } else {
                    document.getElementById(id + 'IMG').src = "/img/cross.png";
                }
            }
}