For those of you who got Error 404s from www.nirvana-motorcycles.com over the last couple of days, this was cause by a hacker who used the trojan/virus called Gumblar to add links to malicious sites in the scripts.
Luckily, the hosting company (www.names.co.uk) has automated systems that detect these types of attacks and took the site down while they reinstalled back versions of all the page.