[Tutor] Displaying image in scrolled canvas

[kromag@nsacom.net]

I am attempting to place a large .gif file into a scrolled canvas. I am 
working from the examples in programming python (in case the code looked 
slightly familiar :-)

To wit:

from Tkinter import * 
class ScrolledCanvas(Frame):
    def __init__(self, parent=None, color='white'):
        Frame.__init__(self, parent)
        self.pack(expand=YES, fill=BOTH)                  
        photo=PhotoImage(file='\windows\desktop\wacky3.gif')
        canv = Canvas(self, bg=color, relief=SUNKEN)
        canv.config(width=1010, height=745)                
        canv.config(scrollregion=(0,0,300, 1000))         
        canv.create_image(10,10, image=photo, anchor=NW)
        sbar = Scrollbar(self)
        sbar.config(command=canv.yview)                   
        canv.config(yscrollcommand=sbar.set)              
        sbar.pack(side=RIGHT, fill=Y)                     
        canv.pack(side=LEFT, expand=YES, fill=BOTH)      
if __name__ == '__main__': ScrolledCanvas().mainloop()

results in the properly-sized frame and scrollbar, but for some reason the 
image does not pop to life. What am I missing here?

d