How can I make an entrance and/or exit popup with CS-CART?


I am looking for code that will generate an entrance popup or exit popup for CS-Cart. I would like to capture the user's e-mail address on an e-mail service provider such as AWeber, iContact, ConstantContact, MailChimp etc. so I can e-mail them back with coupons later on. Can anyone help me with this? Thanks.