>Thanks a lot for your reply; I wonder if you post some sample code, Because I dont get the idea...

I don't have sample code for this handy. It is a non-trivial task to implement. The three big pieces are a webservice that supplies the content including any HTML formatting; a javascript function that calls the webservice after the page has finished loading; a repository for the content (database, XML file, HTML file, etc...). If you haven't dealt with these types of functions before, it's probably not something that should be tried in a time-critical situation. You would also have to redesign all of the pages in the website.

AJAX would simplify the process because the webservice and javascript would no longer be needed. It could all be done in the code-behind.