Today ajax is being a common part in most large website and
application.user loves the way everything done without page
refresh and website's with ajax implemented is getting higher
popularity.in the following i showed how to use ajax in asp.net
web page.you can use in php too -

make sure you have made the following configuration
to your IIS to run Asp.net applications-

.Net framework 3.5 sp1 contains more features than
previous .net framework versions like 2.0,3.0,3.5

It's very common purpose when it comes to insert advertising scripts
or other html codes in a joomla article.you can easily create a plugin
which can insert your code after title or content or before content
of the article.Following way i demonstrate how to achieve
this great task -