Hi terrorvicky and ChooChooGuy -
There's a way you can revise active auctions (including template changes) but it includes a few steps...
1) Locate your listing in your Saved Listings folder, make your desired changes, and save.
2) Check the box next to your updated listing in your Saved Listings folder and click the "HTML" link on the right (this is the complete HTML for your listing).
3) Copy the HTML in the popup box.
4) Locate the item on eBay and click the "Revise Item" button.
5) Click "Edit Description" then click the "Enter your own HTML" tab.
6) Paste the copied HTML in place of what's there and save your changes.
Hope that helps!
Cara