Pictures In Posts too big?

Hi
I couldnt fine any help on this. How can I stop members uploading pictures that are too large, I know they are off site and hosted somewhere else, but too stop repeatedly asking certain ones not to put pictures in their topics that are too large for the forum, I would rather set a limit like you can do in the uploaded Avatars section.
Any Ideas?
Thanks

My other Question is how do I block the bots from scanning my forum, I have stopped them appearing but this doesnt block them does it?

Thanks

There is no default setting in the Admin Panel, but...

Luky has answered this question well in another post. Click here to read it.

Let us know how it goes.

Thanks skittlepc

Or try and get them to use this link...

http://www.pictarget.com/

Thanks efbe