[pygtk] Need help

[Cata]

I use pygtk to create a class.
This class has window = gtk.Window(gtk.WINDOW_POPUP)
I put one image . This image is load from file and show it .
		fixed = gtk.Fixed()
		fixed.put(pixmap, 0, 0)
		window.add(fixed)
		fixed.show()
All this code is on __init__
I have another script this use this class .
Now i need to change image with new one .
Basically i need to change like a animated gif ...
Some ideas ?
Regards ...

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