why don't make another CSS and with all the changes you want then link to it

you can do that by using something like this :
obviusly, put this header in all your HTML pages and then pass the style you want in ALL links (this would be rough) .. and make sure that the link looks like something like this :
<a href="mypage.php?style=bloody">The Bloody Style</a>
and the CSS file name is the exact name of the style var you passed but without .CSS ..
I usualy work with internal CSS and this Idea just poped up into my head ..
hope that was helpful
