Many link lists won't accept a site with the word "Enter" anywhere on the site, especially the index page, with the exception being the Enter link to your site. I've seen a lot of sponsor's banners that say "Enter" or "Enter Here" which makes them useless. I use IrfanView as my default image viewer and ran across a neat feature this morning. When viewing a .gif banner with "Enter" on it, you can select "Stop Animation". This stops the .gif banner from going through all the images it's made of. Here's an example:
http://www.best-wet-pussy.com/sample/
The banner on the left is made from three images. It can be stopped at any one of the three. A side benefit is the file size is drastically reduced without any compression. In this example the file size went from 39.3KB to 19.5KB.
Might want to check with sponsor's and make sure it's OK to modify their banner but if it gets your site listed and maybe traffic to them, maybe they won't care.