This is a great way to define modules for the YUI loader and ensuring the dependencies get pulled in

YUI_new_module.js

YUI.add('breeze-nav', function(Y) {
 
    Y.namespace('bb.session.Nav');
 
    bb.session.Nav = function() {
        // expose an API

       // this in here will execute when it's pulled in through YUI().use()
    };
 
}, '0.1.1' /* module version */, {
    requires: ['node', 'io'] //pull in node, io modules before executing
})



// now you can pull it in from another file
YUI().use('breeze-nav', function(Y){
   //run your code here...
   //everything in breeze nav will have loaded, and the dependencies
});