var user_first = true;
var pass_first = true;

function login_username_onClick() {
    var loginForm = document.getElementById("loginForm_upper");
    if (user_first==true) {
        loginForm.username.value = "";
        user_first = false;
    }
}

function login_password_onClick() {
    var loginForm = document.getElementById("loginForm_upper");
    if (pass_first==true) {
        loginForm.password.value = "";
        pass_first = false;
    }
}