well, ok
btw, if it works in IE but not FF... then the designer got it wrong .. compliant code/CSS should work in FF (that's y there are the box-hack, 3-pixel bug and other hacks for IE .... IE sucks at CSS compliance)
Reminder for all webmasters: You'd better keep a copy of IE6 running. XHTML/CSS designs that work perfectly in FF/Opera have a high chance of being broken in IE6 (yes, there are still many IE6 users out there). I've seen many designs, especially wordpress blogs suffering from "sidebar dropping to the bottom of page" (float drop) caused by IE's 3 pixel jog bug.