Originally Posted by bamasport
put them into paint, click image, resize/skew and put 50% in both, then save. this should shrink them down enough and put them into the right file type to upload here
That method would reduce the size of the image and well at the space it occupies by approximately 75% but will keep it in whatever format it is unless he changes it.
There are better options depending on if he wants to keep the original size and depending on what file type the images currently are.