Need script so code only shows when in browser anyother than firefox

Hello im looking to add my firefox banner text to my website but was wondering how i could make it so it only shows up for people in ie or opera etc but not in firefox
like on http://www.watchblockbusters.com/movie/284-Over_Her_Dead_Body_2008.html

Cheers
Tom

 

if (strpos($_SERVER['HTTP_USER_AGENT'], 'Firefox') === false) {
// add banner code
}

PHP:

 

Cool thanks for that

 

what would the code be so it looks exactly like http://www.watchblockbusters.com/