Help with PHP CSS selector

Currently I have PHP code that runs a server side check on your browser (placed above the <html> tags) and assigns a certain CSS stylesheet to it. The problem I have with the current code is it only goes by the browser and not both the browser and platform. I have the source code (listed below) that shows what the selector does. I was wondering if any of you could take a look at this and give some suggestions to have it run multiplatform (Windows and Mac) and have stylesheets for each like ie_win.css for IE on Windows and ie_mac.css for IE on Mac and so on. Thanks :) <?php $browser = getenv("HTTP_USER_AGENT"); if (preg_match("/MSIE/i", "$browser")) { $css = "<link rel="stylesheet" href="ie_win.css" type="text/css">"; } elseif (preg_match("/Mozilla/i", "$browser")) { $css = "<link rel="stylesheet" href="ns4_win.css" type="text/css">"; } if (preg_match("/Mozilla\/5.0/i", "$browser")) { $css = "<link rel="stylesheet" href="ns6_win.css" type="text/css">"; } elseif (preg_match("/opera/i", "$browser")) { $css = "<link rel="stylesheet" href="op_win.css" type="text/css">"; } ?> -- _______________________________________________ Sign-up for your own FREE Personalized E-mail at Mail.com http://www.mail.com/?sr=signup Have you downloaded the latest calling software from Net2Phone? Click here to get it now! http://www.net2phone.com/cgi-bin/link.cgi?157