Click frame 1 of layer, actions, and label it init. Now open the Frame Actions window and chose call from the + menu. Add ”/scripts:init”, to the Frame window. This means that we’re calling a script in a movie frame labeled init in the timeline of an instance named scripts.  Now click frame 5 of the layer, actions, and using the Frame Panel, label it update.  We’ll now add an action to this frame. In the Frame Actions window and chose call from the + menu (it’s the second one down in Actions). On the right side, add “/scripts:update”.  Chose Go to from the + menu and make sure that FrameNumber is selected from the Type pull-down menu. Enter 4 as the number.