Ajax filter

[eluser]Iwasignited[/eluser]
Hello everyone,
I know this issue is not related to codeigniter but I think I can find help here.
Please take a look at: http://www.authenticjobs.com/
When you click on 'freelance' or 'full-time', the site will load results from database with ajax. Im looking for something can help me do that. And, it would be nice if anyone can suggest me a book and some websites to learn jquery and ajax thingies.
Thank you.

[eluser]bretticus[/eluser]
http://blog.themeforest.net/screencasts/...eo-series/

[eluser]Iwasignited[/eluser]
wow I love screencasts, they r very easy to follow. Thank you very much.