There are now 2 different
Countdown Timers to choose from:
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I really like the V50 Countdown Generator located here:
http://v50.net/cdgenerator.php
An easy GREAT alternative to the other one below 
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Here is the other timer:
For instructions on how to set it up, go to the
Countdown Timer Generator
Note: In order to insert the script into your signature, you MUST be sure that you use the BASIC EDITOR for the Message Editor Interface.
To do this, go to your
Options, and at the bottom of the screen, and change the Message Editor Interface to
"Basic Editor - a simple text box"
Once you have inserted the script and saved your signature, you can go back to the original interface selection.
If you have any questions, post them here or PM me.
Enjoy!!