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It's a very simple example, and in the coming weeks I'll add further tutorials to expand this, such as a registration page, control panel to edit a user profile and an admin page to manage users. For the purpose of this entry however, i'll stick to a simple login feature.

If you are unfamiliar with AJAX, please see my AJAX search tool tutorial where I have explained how AJAX works. The JavaScript code used there, is very similar to that which I use in this example.

I will start by creating a function that creates and returns the XML HTTP object or ActiveX object that is required to implement AJAX. I have put this function in a separate file, so it can be accessed by different pages that use AJAX, instead of having to repeat the function body in every script.