Sanford, thanks to your help, I've got things going exactly how I want.
Some thank you text in the lightbox, two buttons - one to go the main site, one to provide more details, and I even managed to turn off the close button.
Sheesh, no line breaks the inner HTML and don't forget to escape all your single quotes!!!!!
I'm feeling stoked right now mate - and it is all because of your legendary (and very patient) help.
I'm going to have a play - at this point my best guess is your CSS goes into the form custom CSS and the script goes into the LP?
Let me see what I can learn and/or break