You either make sure the image is under 200k (which is plenty and shouldn\'t be a problem... if you have Photoshop use the Save for web function), or you host it somewhere else and link to the image when you post it. The latter can be troublesome, though, because people may skip it if it takes too long to load and if the off-site location goes down temporarily your image will be reported as broken if enough people try to load it.
But, 200k is plenty! The limit used to be 100k and most people could cope with that.