It’s special HTML coding, and it’s called the Hover Ad Creator. I bought it from the late Cory Rudl here. This box is powerful for two reasons:
1. Visitors can’t miss it when they come to your website.
2. It bypasses the pop-up box filters that many people have on their computers.
You need some knowledge of HTML coding to be able to add it yourself. But do what I did. Ask your webmaster to install it.