As I could not use the 'Batch watermarking' plug in since it is in python, any body can suggest how to get it in 'windows' pl. The plug in is here: http://registry.gimp.org/files/batch_watermark_0.py
Adding python support to gimp http://www.registry.gimp.org/node/3916
Adding python support to
Adding python support to gimp
http://www.registry.gimp.org/node/3916