Source thumbnails can now link to different different images than the one which will be displayed, allowing for greater customization and speed optimization as users can now have smaller, browser friendly thumbnails. Specify the source extension to remove in the thumbExt option like so:
$('#displayImage').gallery({source: '#thumbnails img', thumbExt: 'YOUR_EXT_HERE'});So a gallery operating on source images "pic1Thumb.png", "pic2Thumb.jpg", etc and thumbExt set to "Thumb" would display "pic1.png" and "pic2.jpg" in the main display area.
Please see the README for further use details.