The site hasnt been infected with a virus, I opened it at work where we use a hardcore firewall & anti-virus system and it showed it as safe. I can trust in this as I work for a laaaaaarge UK bank, and we're meant to be very IT security aware, else you'd lose all your money!
Anyway, to me it looks like a kid hacker having a laugh at someone elses expense. Its not a hard thing to do, in fact you can download password hacking programs off the net and brute force hack a basic web hosting server in a very short time. This goes back to recent thoughts on here regarding the state of the nation etc. We can be safe in the knowledge that most of the morons out there who'd think this was a funny thing to do are too illiterate to even know where to start!!
On a side note if you own a website i'd recommend you have a password including letters & numbers mixed up, the longer the better obviously. Dont make it easy for have-a-go hackers to do this sort of thing.