post back and AJAX

I have been working on a live help button for our app. It will be used in almost every page on the app. Basically what it is, is a live help button. If so needed, the customer can click this button and a popup will appear with their information in it. They can then send the help request to us for processing. Since we are going to be using this on virtually every page, we need it to be asynchronis. We do need the button to post back, but we dont need to refresh the page when it's done. How this was able to be done was with an AJAX control and asp's script manager. So only the part we need to postback will, without doing the page refresh. I can see why virutally all web apps use AJAX.