I want to be able to design/implement a splash screen that originally goes over the home page (index.html). And when the visitor clicks on the enter page, you could say the Splash Screen disappears. I want to know how to do that without creating another page and without having to redirect.

I also want to be able to give the user the option to Do Not Show This Again...

For example, http://www.runescape.com/

Thank you very much,
Aaron Brewer