Javascript DHTML Fade-in Popup Window

This javascript DHTML fade-in popup (popin) window is like those you're seeing all over the web these days. You can't use window.open() any more because of popup blockers. This script creates a virtually unblockable popup ad or newletter signup form with just a little javascript that you can cut and paste into any page on your website! It fades into the page in an animated manner, so it looks very professional.