Pop up subscribe form

[edmiston99]

I'm looking create a pop up "Subscribe" form like you see on so many sights now. Something that would pop up after a pre-determined amount of time, wher ever you happen to be on a page, and present the opportunity to enter email address to subscribe to email notifications. It must be able to be manually closed by clicking off pop up potentially, or by clicking "X". I've tried doing this, and can't get it to be manually closed.