The browscap.ini file works for IIS servers using .asp, not php (it supplies info to the BrowserType Component).
Use
$sBrowser = $HTTP_SERVER_VARS["HTTP_USER_AGENT"];
This will return the browser the client is using to the variable you designate (here it would go to $sBrowser, but you can use what you want). You can do an ereg to find out if a specific browser is in use from the result.
And good luck doing CSS with Netscrape.
HTH,
Jim