function showLoginForm() {
    document.getElementById('login_form').style.display = 'inline';
		document.getElementById('register_link').style.display = 'none';
		document.getElementById('login_link').style.display = 'none';
    //document.getElementById('login_invitation').style.display = 'none';
}

function showPasswordField() {
    document.getElementById('fake').style.display = 'none';
    document.getElementById('password').style.display = 'inline';
    document.getElementById('password').focus();
}
function hidePasswordField() {
    document.getElementById('password').style.display = 'none   ';
    document.getElementById('fake').style.display = 'inline';
}
function hideLoginForm() {
    document.getElementById('login_form').style.display = 'none';
    //document.getElementById('login_invitation').style.display = 'inline';
		document.getElementById('register_link').style.display = 'inline';
		document.getElementById('login_link').style.display = 'inline';
}
function onusernamefocus(el) {
    if (el.value == 'username')
        el.value = '';
}
function onusernameblur(el) {
    if (el.value == '')
        el.value = 'username';
}