User-Agent redirect?

[Daniel Gary <dgary1980@xxxxxxxxx>]

I have a client that runs a handful of vhosts on a single server, 
frontended by Squid 3 (debian)

What would be the simplest solution to doing a redirect in squid when 
the user-agent is an iphone for example, but only for a specific domain 
(leaving the other vhosts unredirected)

Thanks
-Daniel