@unknownuser said:

800x800....max 256k

What Bruce says.

@remus said:

I tihnk if you link with the [img] tage the limit is dynamic (related to your screen size), it can be useful when you want to include larger pics in your posts.

T embed an image,you need to upload it to some external image hosting sites however,somehow like this:

[img]http://www.gaieus.hu/elemek/Gai.jpg[/img]

and the result is this:

http://www.gaieus.hu/elemek/Gai.jpg

(it's actually a welcomepicture BTW πŸ˜„ )