F5 Check if movie has played before, .. if so stop


I have a movie loaded into a header (which is loaded every time a new page is browsed). This movie spouts out a pop up window after 30 seconds then stops. This works except of course every page time this loads afresh it spouts out a new one.

Is there some sort of way to check if movie has been played (say within a 4 hour period) and if it has not to play (do not spout out the pop up)?

Any help would be appreciated. This is Flash5, thanks