Not a great way to advertise your affiliate programs. SSI requires that you rename your pages from .htm or .html to .shtm or .shtml. If you change it to .shtm, those links won't work unless you set up re-directs. Here is a JavaScript you can use that will not only rotate your banners each time your page is loaded, but it will also display a text link below the banner. Sometimes you need just a few extra words to describe what you're advertising.
Text links are great.
They increase the chance that someone will click on your banner. While you're there, sign up for their daily web site tip. They have some super neat stuff and we've used a lot of them ourselves. Even though we didn't write this script, some things are just worth passing along.