Batch Download Pictures From Website

i can get the prog to download no probs, even mangage to get some good photos, now, my queary is this. how come it downloads thumbnails of some but ful sized of others on the same site? i am getting mixed results. i jsut want the full photo if that is possible..

help a noob?

here is sample gallery that i get thumbnails from. i get same results wtih google searches.

http://www.imagecash.net/gallery.php?gi ... public=yes

anyone? help help?