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// top-level namespace being assigned an object literal
var myApp = myApp || {};

// a convenience function for parsing string namespaces and
// automatically generating nested namespaces
function extend( ns, ns_string ) {
    var parts = ns_string.split("."),
        parent = ns,
        i;

    if ( parts[0] === "myApp" ) {
        parts = parts.slice(1);
    }

    for ( i = 0; i < parts.length; i++ ) {

        if ( typeof parent[parts[i]] == "undefined" ) {
                //create a property if it doesnt exist
            parent[parts[i]] = {};
        }

        parent = parent[parts[i]];
    }

    return parent;
}

// extend myApp with a deeply nested namespace
var mod = extend(myApp, 'myApp.modules.module2');