Pop Up Window To Capture Emails

I noticed many affiliates have a box that drops in to catpure a visitors e-mail. Do you guys know of any tutorials on how to do this? I have listed a url for an example.

keywordelite.com/index1.htm

 

Download and Include this .JS file:
http://keywordelite.com/Popover.js

Then create a Div (your popover) and give it an ID of "dropin"

 

Do you think there is any chance of getting penalized by the search engines for using this tactic?

 

Nah, Search engines don't scrape or parse JavaScript. All they would see is a Div with content in it .