Thumbnail generator program

[Geoffrey]

I have written a website in html and css which requires the presentation
and selection of a gallery of images as thumbnails that can be enlarged
individually to view. Synaptic Package Manager has programs listed (e.g.
photon, webmagick) that will generate the markup code that may do the
job required. Before I try them out I look for suggestions from Ubuntu
members who have experience with web design. Please note that I can
write markup for html and css but not (yet) javascript.
Geoffrey