We need some info from you - all of you, if possible:
1.) What browser (including version number) were you using when you got the warnings?
2.) What version of Java do you have installed? (You can use
this page to find out.)
3.) What's your virus scanner?
4.) Did the warnings come from your virus scanner or from some other security software such as a firewall, AdAware etc.?
5.) What site(s) did you visit before you visited The Collators' Den?
6.) How much time did you spend at The Collators' Den before the warning appeared?
Reply here, or send us a mail to "den_admins[AT]kerfuffle.org".