Is it possible to display a webpage using a lightbox type effect?

I am creating a site whereby advertisers can create adverts. One of the options is to view a preview of their advert. I currently open a new window to display this preview page. I would prefer to keep the user within one window at all times to avoid confusion of multiple windows and therefore was wondering if there is a way to display this preview page as an overlay similar to how lightbox displays images?

I am currently using jquery lightbox to display some images and also jquery for other elements of the site such as tabs.

Any advice appreciated!

Thanks

Paul

I think you are looking for this:
http://yensdesign.com/tutorials/popupjquery/

Which is simple and easy with jquery.