I have changed the code a little bit, thus from now on it will not be shown as large box for 30 days since you have clicked the close(x) button. Also this setting will be reflected for all the pages you visit afterwards. You need to click x button only once.
Please check that out and let me know if you still have any problem.
Wow. That's genius. You think you can make that for a bit less time, though? It would suck to click X by accident, and be stuck without it for a month.