Below you will find banners for your website which you can use. Just look for the correct size and download it the image by right clicking it, then select "Save Image As" from the popup menu.
Use the instructions on the previous page to create the link which you add to the image.
728 pixels x 90 pixels banner
Use these for the top or bottom of the page or inside an article
320 pixels x 100 pixels banner
These banners work great above the start of an article, inside an article or at the bottom of the page.