this.loadForm = function() {

        $("#response-container").load("formLogin.php", function() {

            $("#formLogin").submit(function(event) {

               var user = $("#username").val();

                alert("username: "+user);

                event.preventDefault();

            });

        });

    }; //END loadForm FUNCTION

<form id="formLogin" method="get" action="20.html">
    USERNAME:
    <br>
    <input type="text" name="username" />
    <br> PASSWORD:
    <br>
    <input type="password" name="password" />
    <br>

    <br>
    <input type="submit" value="Log in" name="login" id="btnInputLogin" onsubmit="return false" />
</form>