//You Need This Line For Each MovieClip You want to switch between.
PAGE_1.addEventListener(MouseEvent.CLICK, onPageChange);
PAGE_SEVEN.addEventListener(MouseEvent.CLICK, onPageChange);
contactPage.addEventListener(MouseEvent.CLICK, onPageChange);
aboutPage.addEventListener(MouseEvent.CLICK, onPageChange);
randomPage.addEventListener(MouseEvent.CLICK, onPageChange);

var lastPage:*;

function onPageChange (e:MouseEvent) :void
{
	if (lastPage) lastPage.visible = false;
	lastPage = e.target;
	e.target.visible = true;
}