There are a couple of ways to create namespaces for your code.  This format allows you to intentionally expose functions as public or keep them internal/private.  I like the following version…
 
var mynamespace = new function () {

var internalFunction = function() {      //TODO: code };

this.publicFunction = function() {     //TODO: code };

• A namespace is a container and allows you to bundle up all your functionality using a unique name
• In JavaScript a namespace is really just an object that you have attached all further methods, properties and objects
• Without the usage of namespaces every function will be in the global (aka window) namespace (this occurs by default if you do not use a namespace).  It is a good practice not to clutter the global namespace
• Using namespaces prevents the overwriting of existing function names
• Using namespaces is one step in the direction of object-oriented which promotes modularity and code re-use