JS Scoping trick

scoping.js

var forUserFunctions = (function(window, document) {
    var privateElm = document.getElementById('supersekrit');

    function setNewText(newText) {
        privateElm.innerHTML = newText;
    }

    function capitalize() {
        privateElm.innerHTML = privateElm.innerHTML.toUpperCase();
    }

    return {
        setNewText: setNewText,
        capitalize: capitalize
    };
})(window, document);

forUserFunctions.setNewText('Foo bar lol');
forUserFunctions.capitalize();