>If you mouse over them they tell you if the user is online or not. 1 rhomb means the user is not online, 2 means that the user was online within the last 2 hours and 3 means the user is currently online.
Michel is using ALT="This member is not online", which doesn't work in Mozilla - new fashion is Title="..." which would probably work in all browsers. I think it's HTML4.01 feature or something like that.
Anyway, I don't need it to work now that you tipped it off :).