Crackers Destroyed Website

I was rather annoyed the other day when I logged into my main website to discover that some cracker had cracked the code on it and plastered very nasty junk all over the website. I tried to hack into the code from the backend and remove the infection, but I did not have very much patience and finally just dismantled the entire website. I will be rebuilding it as soon as I have enough time to dedicate to a full rebuild.