Hmm. You could do an inline frame for the image. It wouldn't work in older browsers, though. The other drawback is that there would always be a fixed frame size.

A 32x32 pixel image would take up the same space in a post as a 1024x768 pixel image except that the smaller image would have a huge blank area and the larger image would be constricted but scrollable. The alternative is to force all inline images to a certain width & height.

Peace,
Drew