Hi Ken for most part 80kb is more than big enough, you could have quite a big .jpg file for that, like wowbagger said use jpg as you will get the best compression, the size limit is needed to conserve bandwidth if you have a 800k file which is almost 1meg it would use a lot of bandwidth every time someone viewed it, you can also look at
this thread you can upload slightly bigger pictures, but please keep in mind the max size of 640x480
