topr8 - 8:00 pm on Dec 7, 2010 (gmt 0)
you can't run php code in the css file
unless you have set up apache to parse css as php of course.
personally i use 'dynamic' css a lot - and i serve the standard css file then in the head of the page using php i do something similar to what you did, this then overwrites (has higher precedence) the css file.
surely there is a firefox extension that lets you view the 'assets' of a page, eg. external style sheets, images etcetc