Well mcafee is, at least here, notorious for thinking everything is a virus - which I would've accepted if it was only the javascript - but since it tried to execute something I'm more worried.
I disabled mcafee and entered labmice.net, it downloaded something without prompt (I believe that to be the 'readme.txt%00demo.exe'.
-M
The piece of .exe is detected as CoreFlood Trojan (that is according to nai distributed with js/cisp)
Here is info on the virus
http://vil.nai.com/vil/content/v_100312.htm
And,
emphasis on and. My registry has been modified to run an unknown program just like nai website suggests.
The site is virus infected.