I have a problem. I mean, you have a problem. This site has no logout button.
Why is this a problem?
Because I use this forum from public computers at my school. At first I didn't notice anything unusual, but then my friends found out about it and told me.
When I have left the building (ok, the workstation) nobody can login to this forum from the same computer. Apparently ever again! Whenever somebody tries to post here, they are presented with my name and prompted for password. Of course they cannot pose as me, because they don't know my password, but they cannot register as themselves, all they get is something like "you are already registered" or similar.
Now this has become a problem because I have probably used dozens, if not hundreds of different workstations for reading e-budo. Now none of them lets anybody else in, but me! I have tried deleting the history, all the cookies but no use.
I strongly suggest that you add a logout button that completely forgets the machine from which the visitor logged in.