AVG: http://www.avgthreatlabs.com/website-safety-reports/domain/boo.pl/
SUCURI FINDS THE JAVA MALWARE: http://sitecheck.sucuri.net/scanner/?scan=http%3A%2F%2Fblog.wojtek.boo.pl%2F

Its just at the top of the Site Code. (Screenshot)
So your site got hacked most probaply.