How to determine the browser

It turns out that the client can show the browser with such a funny hack :)

:
<img
/''src="firefox.gif"
/""src="sleipnir_gecko.gif"
"src="safari.gif"
""src="konqueror.gif"
/src="ie.gif"
src="opera.gif"
src="lynx.gif"
>

( ):
<img
/src\x00="ie.gif"
/''src\x00="firefox1_5.gif"
/''src="firefox2_0.gif"
/""src="gecko_others.gif"
"s\x00rc="safari2.gif"
"src="safari3.gif"
""src="konqueror.gif"
src\x00="w3m.gif"
src\x0c="opera.gif"
src="others.gif"
src="lynx.gif"
/>

source with a clear example ( updated - understands safari )
ps: not recommended for practical use;)