Learnflash tut

1

i tried a tut from learnflash weekly freebies. its is pop up mc. when i click on a mc a pop up window comes on stage. it works. I love it. The problem is that when i click to go back to my home page the pop up is still there. can someone show me how to write an if statement to get it off the page. thanks

here is the code i have

 
b2.onRelease = function  () {
 var t:MovieClip = container_mc.attachMovie("norwaypopmc","popus_mc",container_mc.level1());
 t._x = 675;
 t._y = 400;
 
}