Avoid Cookie Stuffing in your affiliate program

If you run or write affiliate programs, you might be aware of "Cookie Stuffing". Affiliates that are loading your links into small images in their pages in order to send an affiliate code cookie to the client browser and credit themselves with sales that may or may not accrue sometime in the future by a customer that is unaware that an affiliate cookie for Amazon.com has been planted on their computer by a different site. This is a major revenue loss for many online businesses.