Forum Display notice according to browser?

[محروم.كوم]

Ok here my problem:
I have tried all of the available scripts for drop down menus on here as well as VBorg. The common problem seems to be that IE7 completely screws up the menus and sets the drop downs to 100%. As far as I can see this is something to do with the js that Vbulletin uses, but I don't confess to know that for sure.
To be fair IE screws up most things anyway but I can't ignore IE7 users. AOL uses IE as well so far too many potential members lost I think.
So I wondered if notices could be used to warn IE7 users that the site won't work properly unless they upgrade to IE8 or higher.

If this can be don... can anyone tell me how please? __DEFINE_LIKE_SHARE__