Getting browser info

Hi i need to get the Browser version, type of the user. i need the short  name not the long one.
at the monent i have this:
browser = Request.ServerVariables("HTTP_USER_AGENT") that retuens this:
Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.1.249
i need only (Chrome/4.1.249), (MSIE 8.0)...............


plus  i would like to get the operating system too


thanks
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