Changing files without making new images?

[moonlite56 at yahoo.com]

Is it possible to change the image file of an image object in 
Tkinter without making new image objects? I'd like to do this 
because the program I'm writing uses a whole lot of images, and I 
don't want to make image objects for each one. :)

from Tkinter import *
import Image,ImageTk
top = Tk()
top.title("Kuti")
top.geometry("200x100")
iKuti = ImageTk.PhotoImage(Image.open("body/lighttan.gif"))
iKuti2 = ImageTk.PhotoImage(Image.open("hair/brownbuns.gif"))
iKuti3 = ImageTk.PhotoImage(Image.open("outfit/whiteblouse.gif"))
top.mainloop()

Also, this program uses images in a directory. Is there a way to 
move through each image without renaming them to 1.png, 2.png, 
3.png...? That would allow me to add as many images as I want, and 
pushing a button will display the next image. Any ideas?