Javscript browserdetect

How do i install this? i tried but it won't work and i don't know a thing about javascript soo

i just want it to warn every browser except Chrome and Opera

going to need more information then that.
1. What script are you using
2. where do you want it installed?

just on my homepage but iknow how

here is the one i use now but i think it fails
http://247-gaming.webs.com/Browser%20Detect/browser-detection.js

i want it to appear once every session not every load

BUMP

Try new one
http://lmgtfy.com/?q=+javascript+browser+detect