You have various ways to do so. If you are not familiar with Actionscript then it would be hard for any of us to instruct you. I can give you a link to follow some of the tutorials.
http://tutorialoutpost.com/count/5113
http://www.frunder.com/tutorials/flash/blureffect/
http://learnflash.com/wp/

Browse the links - the last one has video tutorials I think you will find them useful.
You also have a paid site http://www.cartoonsmart.com/advanced_smart_topics.html

Hope this helps.

Availor