The site in question can use php, it was built using alot of php. I have only started to use php through helping this guy with his site so i dont understand the ins and outs of it.
I know this can be done as many sites already have it i'm just not sure how to implement it to the box I have created.
(site in question)
(site that has this function)
As for the popup its html / css its just a div that shows when needed and hiden when not needed, I just
cant work out the hiden part as I've never used Cookies.
If a $_SESSION only lasts whilst the viewer browses the site, the next time they go on they're gonna see the message again, so I need a $_COOKIE then as i don't want it annoying the viewer everytime they visit. I know that a cookie you can change its expiration time so it can be set for say 90 days.