the way i code, is that i have a controller function

Code:
controller = function() {
timer()
player()
enemies()
}
something like that... this one enterframe loop controls everything.

to start it....

onEnterFrame = controller;

to stop it...

delete onEnterframe;

to start it again...

onEnterFrame = controller;

so therefore pausing is extremely easy. If you need to pause movie clip animation strille has posted a nice function to do this recently.