How to load a custom stylesheet for 2 useragents?

I have two user agent strings:

Mozilla/5.0 (iPad; CPU OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3

Mozilla/5.0 (iPad; U; CPU OS 4_3_2 like Mac OS X; en-us) AppleWebKit/5开发者_如何学Python33.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8H7 Safari/6533.18.5

The first targets iOS5 and the second targets iOS4.

Is it possible to load a custom stylesheet for the first user agent string, then a different one for the later user agent string?

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this tutorial should be helpful, it explains it in details : http://davidwalsh.name/detect-ipad

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if you uses php, just check $_SERVER['HTTP_USER_AGENT'] for value you need and place <link href="yourstyle.css" rel="stylesheet" type="text/css"> in head tag