(Another) question about html and css

I think he was referring to an "if" or "if / else" statement. A quick google search brought this to light.

http://www.quirksmode.org/css/condcom.html

I personally have only used this once or twice, and it was to redirect IE users

Ah, I see. That makes a bit more sense. I wish it were for firefox. I'm not so much concerned with IE, though since a majority of people do not use it.