Ok I am new to css but understand what I am doing so far but I am now just wondering if I can set a percent such as 99.6% for the width of my div? If so will it look different in different browsers?

That's all I was wondering.

Also I am still running IE6 and my pings don't work I get a white BG. I know there is a fix for it on google but I am wondering do a lot of people still use IE6? If so should I use the fix I found on google or am I safe just leaving my code the way it is and upgrade my IE broser to IE7?