Pop up adjustments possible?

Hi,

I've been testing pop up on this site but I would like some adjustments for the following. I don't know if you're familiar with european legislation but as a site owner we are obliged to notify users of the use of cookies on our site and let them agree.

Maybe pop up can be adjusted in a way it is possible to use it for this. I tried to achieve that on dailylifescrapbook but the cookie that is set isn't perfect and I did some adjustments in templates of the plugin that will be overwritten when there's an update.

Best of all would be a pop up behaving like the thing they have installed on this site (at the top): http://www.xs4all.nl/klant/