Using
ebay's add pictures button means you have to pay for each one. I upload the one free pic to
ebay to use as my gallery pic like Puzzler and then use HTML for my listing. Using HTML and JavaScript you can have as many pictures as you like for free. I host my pictures on Photobucket and use the same sort of code that Puzzler showed you in the other thread to link to them. I actually set up a table, with the thumbnails showing down the left side and then the enlarged pic in the centre, and you click on the thumbnails to change the enlarged pic. This involves a bit of script though and some knowledge of HTML. You should be able to use the line that Puzzler showed you, repeating it with each different image, like this:
<img src="http://i957.photobucket.com/albums/no57/username/eBay2010/Stamp.jpg">
<img src="http://i957.photobucket.com/albums/no57/username/eBay2010/Stamp_rear.jpg">
Did you try that?
Actually if you add <center> at the start and </center> at the end of your images, they will appear in the centre instead of the left side, which looks better. So put that right at the start and end - <center><img src= ... etc
Balf