Joomla/PHP Project (sharkw)

Project Details: I have a Joomla 1.5 website that promotes a liqueur product and needs a basic age verification. I need a popup script written that pops up a window (500x300 center screen) and fades out the home page (shadow). Inside that popup window, I need a disclaimer that has an age verification check box, disclaimer message and two buttons. One button says "Over 21" and the other says "Under 21". When they click on the "over 21" they can enter the website. When they click on "under 21" they are sent to [login to view URL] VERY IMPORTANT..... The check box and verification needs to be cookie enabled with a timer (2 weeks) or something close to that so that they don't see this popup again for 2 weeks (example) SAMPLE Extension... http://extensions.joomla.org/extensions/style-&-design/popups-&-iframes/3688/details ....does kinda what I want to do (with a "session aware" feature) but it DOESN'T prevent you from entering the website. I need to make sure this popup CANNOT be bypassed and you must check the box to continue to the [login to view URL] (home page) Funds will be escrowed.