cray

Hi, newbie in need of help here! :) I have a page with a list of 11 tutorial videos. What I need to happen is that when a user clicks the "GO" button next to each video it first checks if they have the "mycookie" and if they do not it pops up a window say 300x300 with my registration form in. If the system does detect the cookie on the click though then it simply runs the video they asked for in a new popup window. Any help with this would be greatly appreciated.