manually close a window on top of a movieclip

Anybody,

I have a loadmovie function that places a window on top of existing movie. It acts a pop up window to zoom up on the item someone clicked on. I would like to manual close it with a box with a x in it.

Do I make a button i the top corner that unloads the current pop up window?
Are there better more efficient ways of a pop up window and manually closing it?

Thanks Brian