Which is exactly what I do as well [what Jeremy said]
Smaller: there's two kinds of smaller...file size as in how many kilobytes or megabytes the pic is, and actual measurement size, as in how large the picture actually is - its physical size.
A small photo, say 3 x 5, can be a larger file size than a larger photo, say 5 x 7, if the small image is saved at "best" quality, or something like 300 dpi, and the larger image is saved at "low" quality, or something like 72 dpi.
File format also affects file size as far as kilobytes and megabytes go, i.e.: .tif, .jpg, .gif, .bmp, etc.
Any photo-editing program should let you crop to get rid of the unnecessary parts of the image, and then resize to get the right physical size, and then save as a particular quality, or dpi, to get the right file size.
Hth,
Shirley
