If it's a jpeg, you can reduce the quality (increase the compression) to reduce the size further. GIFs and other formats don't allow for this compression variability.

When I do post pix ONTO the board, I usually decrease the quality by about 70% (starts as a very high res. shot tho) and it STILL looks excellent.
Also, as you know, crop the pix to only what is relevent. And because of the restrictions on this board, as already stated, reduce the size to 800x600 or less.

Chris
'85 300SD