That is a really old website.
I never have seen it being flagged as malicious before.
Ofcourse it can be infected now, but I have my doubts.
I think it is better that avast have a look at it.
It is NoClose, it is not so much malware but could be considered a nuisance so as it may give the unaware the creeps and nerves.
It does not so much do harm to your 'puter, (could close your Taskbar etc.), but it is damaging because it can startle those that experience it for the first time around. Reminds me of endless “Rickrolled”.
Some geeks used to show this to script-kiddies before blocking them. “Hey go play somewhere else, you have been rickrolled!”.