JavaScript: How to create a stylish loading bar as Gmail in javascript

Well, let’s focus on the new tutorial called: “How to create a stylish loading bar as Gmail in javascript“. As you can suppose it will be about how to create the famous loading bar from gmail or other sites as tuenti.com (”the spanish facebook“), etc. But the magic on this tutorial isn’t the loading bar, it’s the way to load all resources like javascript, css, and other static files that our web application will need, to delete user waiting times during his visit.