why would you not just design your site to support all browsers?
or if it does not support all browsers just put a note on the page that it is best viewed in a different browser?
I only have one script that does not work on a certain browser and it is FF it does not work on. But I boldly tell people if they want to use it, to use IE only.
www.ipwnedyou.com/signatures
hmmm i dont know I just wanted to type something.