Creation of script for a lock panel over my site

Hello, I would like some help on creating a script for a lock panel that would appear over my wordpress blog? that lists my CPA offers, so that visitors have to fill out one or more of them in order to gain access to my site.? The script should allow me to set certain parameters, such as how long before the panel appears when someone visits my site, how long before? the panel "unlocks", allows me to upload an image onto the panel, etc. Thanks!