[Flash 8] How do I get rid of a movieclip when I return to the keyframe a second time

I have a big Flash project that I want to update with a sort of “Breaking news”-pop up.

I load my pop-up in a movieclip “Target_MC” simply by adding the action script:

loadMovie(“extra.swf”, Target_MC);

In my “extra.swf”-file I have a close-button with the action script:

on (release) {

unloadMovie(_root.Target_MC);

This works out fine. The thing is that the keyframe where I have the first action script is a place you come back to many times. ANd every time this extra.swf-file pops up… anyoing!

Is there a way to say that the movieclip “extra.swf” should just load once? or not repeat? or disapear the second time?