This really got my head scratching...

Forum with pictures:
<http://forums.cgsociety.org/forumdisplay.php?f=137>

Final location of, let's say, an interesting picture:
<http://features.cgsociety.org/newgallerycrits/g63/439563/439563_1302003407_large.jpg>

How can a person download all the "*_large.jpg" images from the
<http://features.cgsociety.org/newgallerycrits/> and all of it's subfolders?