Questions about chat text

Content Development NPCs
1

Is there a line break for player chat?
I remember there was a server that used something like that, and it lookked pretty nice.

Also, I can spam my own screen full of text but other people will only see 220(?) leters I think.
Can I somehow limit the text lenght on the players home screen to equal the amount other people see?

2

… And, how do I make showtext apear over showimg?

3

changeimgvis index,layer;