Which picture - a post or Avatar picture ? Is it too big ?
Try this - This is one of the easiest program on the net to resize your pics....
http://bluefive.pair.com/free95.htm
Scroll to PixResizer……Download the program..it’s really small and very easy to install – Depending on the size of your image you just have to click ONE SIZE (USUALLY 50%) or 460 Pixels and it resizes it for you...
SAVE YOUR PICTURES AS JPEG’S or they will not show as thumbnails.