They are really irritating sometimes, and can be accidentally clicked while clicking your joints, and may as well be links to viruses. Well, i'm not a windows user so don't have to worry about viruses, but still, for most people, plus it costs you your opener sometimes.

Well, theres nothing you can really do...

But type (/cl), Witch clears the Chat area

Also, try telling everyone to be mature, ingame.

also, I have a question, how I change the lines I can see (no tab), i mean with a command

/chl <the number of lines you want>
example:
/chl 20