Slidein cookies - there aren't any?

Hi, I like the plugin(hence I bought it:grinning:, but there's something I can't get to work.

My slidein is on the homepage. I've ticked the option to "hide all messages for the visitor" when they close the slidein. But when they do it keeps coming up next time they reload the page or simply click back on home from a different page. This is kinda frustrating.... Another plugin i got which is a bit similar to this uses cookies to keep track of when to switch off. I thought this would have the same functionality...??

Ideally I'd like the slidein not to react to the ip for a certain amount of time (say 2 weeks)

any help?