Bill
Good News... I have added a new download that contain just the revised script. I have tested this script on DNN V6.0.1 all is good.
The issue is related to JQuery so I modified the script to launch via JQuery. I also addressed several issue with rather poor syntax that might bothered some browsers. ( used JSHint to find issues) The new version of the script has many tweaks to improve both load time and syntax compliance.
However, if you feel brave, just edit the existing TMinus.js (../desktopmodules/tminus/tminus.js) and replace the following - found at the very end of the file:
window.onload=start_countdown;
with
jQuery(document).ready(countdown());
and save the file. Launch or refresh the page and you should see your count down.
Hope this helps,
Paul.