Image Sizes In Posts

[محروم.كوم]

I have an issue and hopefully someone can give me a few tips/instructions.
This probably sounds like a stupid question....

Several times now we've had members post image URLs in a thread and the
images show up so huge they blow out the page parameters. We've enabled
the image upload w/thumbnails but occasionally someone will enter a URL from
Flicker or Photobucket instead.

Is there a setting that we can rachet down the size of the image when its done
this way? Id like a max size of approx half of a business card [2" x 2"] for URL
images.

Can someone tell me where this setting is and how to set it?

[breadcrumb appreciated]

Thanks __DEFINE_LIKE_SHARE__