function check_username(form)
{
    var username = form.value;
    x_check_username(username, check_username_me);
}

function check_username_me(result)
{
    document.getElementById("username_check").innerHTML = result;
}

function check_email(form)
{
    var email = form.value;
    x_check_email(email, check_email_me);
}

function check_email_me(result)
{
    document.getElementById("email_check").innerHTML = result;
}