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EasyPermGals is based on EasyGals by Walter Vos. Where easygals allows you to manually activate the automatic gallery feature on a per-post/per-Page basis, EasyPermGals does this automatically. Each and every post or Page is checked for attached images which are then displayed in a neat gallery underneath. Lightbox, if installed, may be used to view the full-size images.

After a feature request, I added the option to switch between manual and automatic thumbnail attachment. This allows you to define, exactly where the thumbnails are supposed to be embedded.