For ex I created "-1.gif", derived from your "0.gif" that looks quite nice.
Can anyone see the image? I can't.
Strage. When I preview the message, and right after i submit it I can see the image just fine. But when I enter from another computer it's not displayed. (I used the same method for all images, except that the last one is gif)
Anyway, here is the link to the image. Hope you can access it.