01-13-2006, 10:48 AM
Open the image in an any image manipulation software that allows you to change image size. Either set the crop to be constrained (fixed) at 100x100 pixels or change the images size so that it's longest dimension is 100 pixels, that means if the image is a horizontal format the horizontal width will be 100 px and the height will be shorter. Than save it in the JPEG or GIF format.