Replaceable Variables

to simplify future modifications, I placed variables likely to change at the beginning of the script:
"webGeometry='900x700>'" and "thumbnailGeometry='200x100'"
generate a unique title:
outHtml="$(date +%Y%m%d.%H%M%S).html"
date output for naming files is very useful (especially for backups)

to simplify future modifications, I placed variables likely to change at the beginning of the script: