Init and Resize iFrame on Facebook Application Canvas Page

gistfile1.js

window.fbAsyncInit = function() {
    FB.init({appId: '{{ facebook_app_id }}', status: true, cookie: true, xfbml: true});
    FB.Event.subscribe('{% if current_user %}auth.logout{% else %}auth.login{% endif %}', function(response) {
        window.location.reload();
    });
    FB.Canvas.setAutoResize();
};