Hi,
Use Jquery or Ajax update panel.
I prefer Jquery only b'coz easy to learn and easy to use.
you can make magic with jquery.
for posting and retrieving information to/from page just use any of these $.post()
or $.get() method without page refreshing
Step into Jquery
Here is the link for learn Jquery.
http://www.impressivewebs.com/jquery-tutorial-beginners.pdf
there are too much stuff in net browse that
All the Best