NP, and most people around here don't hate newbies as long as they are willing to learn.
The people who just come here to get someone to do their work for them (for free) on the other hand...
Anyways, that script as I wrote it would go on the the first frame of the main timeline holding the clip you want to control, and yes you would have to put in the name of your clip. myMC is just there as an example.
Thing is, I misunderstood what you wanted. If you want the clip to pause on its last frame, change the script to this, and place it directly on the last frame of the movieClip you want to pause:
ActionScript Code:
//Stop the clip
this.stop();
//Declare the interval with a 20 second timer
var myInt = setInterval(pauseClip, 20000);
//Declare function interval calls
function pauseClip() {
//Play the clip
this.play();
//delete the interval so it only happens once
clearInterval(myInt);
}
As for your last question, you don't have to worry about it.
Every movieClip in Flash has its own independant timeline. Stopping the main timeline would not stop the animation in movieClips on it, they would need to be stopped seperately.