SEO plugin for friendly url

[Study]

Dear friends,
I want seo plugin for friendly url in my forum.
Example, normal url:
http://www.example.com/forumdisplay.php?f=5
http://www.example.com/showthread.php?t=6

What i want:
http://www.example.com/Social-studies/
http://www.example.com/Social-studies/Guide-For-Society/

I hear about the plugin of vbSEO, but when i went to there website, it doesn't work.
Somebody can help me with good plugin for my wishes please?

vBulletin version: 4.2.2

Thanks.

[Brandon Sheley]

vbseo is dead
dbseo is your only option, but what happens if it dies..

You're using vb 4 which has built in "friendly url's".. Have you checked them out at all?

[friendlymela]

Its available in vbulletion settings option