Hi rpw,
To remove these extra images from your listing, please log into your eBay account and click the "Revise your Item" link on the auction. Then, scroll down about 1/3 the page to the "Description" section and click the "Standard" tab on the editor. After clicking the "Standard" tab, you will see your description within the editor exactly how it appears in your listing, and you will be able to make delete teach image by selecting it with your cursor and clicking the "Delete" button on your keyboard.
NOTE: Since this revision entails editing the content of the description, you will only be able to make this revision if the item has not received any bids and ends in greater than 12 hours.
-Mike