The file permissions are the same as were there on lthcwww.
The directory "/var/www/demos/mac" has permission

drwxrwSr-x  3 rathi  ipgdemos 4096 2008-08-05 17:34 mac

This is the directory structure of "/var/www/demos/mac"
with permissions.

drwxrwSr-x 3 rathi ipgdemos 4096 2008-07-24 15:17 images
-rw-rwxr-- 1 rathi ipgdemos 3272 2008-08-04 16:18 index.php

The file permissions for files inside the directory "images"
are -rw-rwxr--.

There is no directory inside "/var/www/demos/files" for this demo.

Line 19, 22, 28, 54, 57, 74, 77: Images from the direcory "images" are displayed.

This is a completely static demo. It does not generate any new files.
The file "index.php" just displayes the files residing in the directories
"images".