Where do I put the new GreenfootImage ("_____.png")
Well, in my code, lines 24 through 36 create the back image of a card. You can replace this with the code needed to set the proper back image to the cards. You could change the 'setImage(int)' method to a 'setImage(int, int)' method to pass a second index for another array of images.
danpost, thank you so much for all your help. I wouldn't even be close to being done if it wasn't for your help. I turned the project in and will keep you posted about the grade I get (if you would like). :)