Contact sheet script for InDesign

Required: an InDesign script, written in JavaScript, that does the following: 1. Asks user for a folder. 2. Imports, in alphabetical order, each graphic from that folder into a new InDesign document. Document is A4 size, portrait. 3. Fits as many images per page as possible whilst keeping them at actual size 4. Adds the filename underneath each image. This text should be in a particular paragraph style and on a separate layer to the images The script only needs to work with InDesign CS5.