image loding dont flame

ok i have made my first sig i think it looks allright and i have tryed to post it in the off topic sigs and avvies but when it came to loading it onto image shack it said it was no compatible i made it with adobe photoshop 7.0 and tryed to edid it in paint but was not compatible with that eathere. what am i doing wrong can some1 tell me.

what did you save it as try saving it as a jpc file

thx that worked