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[museion]

Hide .Extension

[gfwilliams]

There's a function called getNiceName: https://github.com/gfwilliams/ThinGallery/blob/master/gallery.html#L317

I reckon if you add something to the end of that:

// Make a displayable name from the URL
function getNiceName(href) {
  var niceName = href;
  // remove trailing slashes
  while (niceName[niceName.length-1]=="/")
    niceName = niceName.substr(0,niceName.length-1);
  // if there's a slash mid-way, delete what was before
  if (niceName.lastIndexOf("/")>=0)
    niceName = niceName.substr(niceName.lastIndexOf("/")+1);
  if (niceName.endsWith(".jpg"))
   niceName = niceName.slice(0,-4);
  return niceName;
}

you should be sorted :)