Xml Search with "Adding Thumbnails"

I used Kirupa’s Thumbnail Gallery and everything works well.
In gallery section I have 2 categories…One of has 148 images, the other one has 264 images. So that I need a search engine for thumbnail gallery.
I have read the posts about xml search in forum but I couldnt find a solution.
Can anyone help me about adding a search engine for Kirupa’s Thumbnail Gallery…? :ponder: