//-------------------------------------------------------------
// your-company.js

window.yourCompany = {
    version: '1.0',
    namespace: function(path) {
        var part,
            currentObject = window,
            parts = path.split('.')
            ;
        for (var i=0, len=parts.length; i < len; i++) {
            part = parts[i];
            if (!currentObject.hasOwnProperty(part)) {
                currentObject[part] = {};
            }
            currentObject = currentObject[part];
        }
        return currentObject;
    }
};

//-------------------------------------------------------------
// your-company/ui/wizzle.js

(function() {
    var ns = yourCompany.namespace('yourCompany.ui.wizzle');
    ns.defaultSize = 'tall';
})();

//-------------------------------------------------------------
// Console

console.log(yourCompany.version);               // -> 1.0
console.log(yourCompany.ui.wizzle.defaultSize); // -> tall
console.log(window.ns);                         // -> undefined