I have written a set of scheduling scripts in PHP to keep track of employees working 24x7.

http://www.angorasoftware.com/schedule

Working demo and all source available on my site.

...also, the latest version of ScriptViewer-- the application that removes the need for PWS and clears the way for you to distribute PHP-based pages on a CD-ROM --is also available on the site: http://www.angorasoftware.com