Hover ad on website.

I want to promote some affiliate stuff on my website at [login to view URL] via a hover type ad. It's a basic ad that will appear on all pages and only load once per visitor, but it must be able to get past pop up blockers etc. and load gradually, blanking out the actual content of the page. You can see something similar on : http://www.caribbeanpot.com. Allow the page to load for about 7 seconds or so. This one is done with an aweber code, so I can;t tell you exactly what that code is. I'm sure there's a free script online that would make this very simple to do. along with what I mentioned about I'll need to know how to edit the ad within the script that you install/use so I change the ad when I see fit. The site is a wordpress blog, so you know which platform you'll be working with. BTW, aweber calls their script a lightbox ad script. ## Deliverables Pleas elet me know your bid, if you understand what i want and how long you'll need to get this accomplished.