How to update a web page without reloading the web page using AJAX?

Question

I\'m trying to update info that a users entered in to a mysql database using php without reloading the web page how can I do this an example or tutorials will be nice.

Answer 1

This question is about taking an email address from a user, adding it to a database (or otherwise processing it with php), and updating the web page without reloading the page, ajax style:

Javascript/css/php/mysql to collect user email addresses in a div on a website

The answer to that question should provide a good template for what you're looking for.