1. Download smoothgallery and extract/copy "resize.php" and place it somewhere in your server
2. Open "jd.gallery.js" (located at "/wp-content/plugins/dynamic-content-gallery-plugin/js-mootools/scripts/")
3. On line 69 change "useThumbGenerator" from "false" to "true"
4. On line 70 change "resize.php" to "http://yourpathtofile/resize.php" (where "yourpathtofile" is the path where you placed the resize.php file)
5. Save changes and upload.
The resizer.php changes on the fly the size of the image that the plugin uses as the div background for the thumbnails, it doesnt create a new resized thumbnail file but rather stored it in the cache.
It changes the image path from:
"imagen.jpg" to
"http://yourpathtofile/resizer.php?imgfile=http://yourpathtoimage/imagen.jpg&max_width=100&max_height=105"
Hope this is useful…