crop u can only crop a square in CS2.. so thats not help of to u..u have to have a good mouse. . not a dead one that skips. lol.. well, go to:
file>new
background contents> select "transparent"
select a big enough size for you picture
now.. if u already had that picture u wanted.. copy and paste it into the new transparent one u just made.... now open the eraser menu by holding onto the eraser w/ ur mouse n select background eraser if u want good results..
now, delete the contents of the background(easier if it is one solid color, if not.. try just using the normal eraser) and smooth the edges with the regular eraser one u are done..
u should be all set..crop it down n then just save it as a .GIF! not jpeg or any other format..
i prefer just using the regular eraser and having the picture maginified 300-600%.. so i can see the pixels. its much easier that way..