Pause/ wait a movie

Hey guys, hopefully just a quick one,

i am doing this lonnnnnnnnnggggg movie for a client, which is basically a thumbnail gallery, although not interactive, so an images is selected and then grows to full screen, and then pauses and then shrinks, then the next one does it, all the while the rest of the thumbnails which have not been selected fade in and out. however, i have miss judged the length of the pause, and was wondering wether action script has such a feature, or if i can set one up, so i can change the length of a pause,

i hope u get what i mean, thanks in advance, andy.