how to put image as background of window

["srinivas" <srinivas puretek com tw>]

Hai all , iam very new to gtk.
    actually i want to paint (not exactly paint but lay another image) part
of the image at runtime.
like a constant background with changing images at fixed position.
i need all of your guidance, presently iam using gtk1.2 and iam restricted
to use it.
you guidance will be of greate help.

Thanks in advance,
Regards
cnu Taiwan