works nicely for me in firefox/opera, but doesn't do too well in anything else... although I'd doubt you'd need to worry about them too much, still, it's always nice to see apps like this fail gracefully, if you had a 'this particular browser isn't supported' type message rather than 'something went wrong'
http://imgur.com/a/chkc2
broken useragents..
konqueror: Mozilla/5.0 (compatible; Konqueror/4.6; Linux) KHTML/4.6.5 (like Gecko) Fedora/4.6.5-8.fc14
seamonkey: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.19) Gecko/20110429 Fedora/2.0.14-1.fc14 SeaMonkey/2.0.14
dillo: dillo/0.8.6 < -- wouldn't worry about that one too much :)
epiphany: Mozilla/5.0 (X11; U; Linux x86_64; en-ie) AppleWebKit/534.16+ (KHTML, like Gecko) Version/5.0 Safari/534.16+ Epiphany/2.30.6
midori: Midori/0.2 (X11; Linux; U; en-ie) WebKit/534.7+