How to access a function from another AS file?

[5TonsOfFlax]

I said it was a bare sketch, you're going to have to fill in some blanks.

In this case, change LibPage to extend MovieClip instead of Sprite, and import flash.display.MovieClip.

Also, I expected you to put the Main code in the timeline. Not because it's better, but because I thought that would seem more intuitive to you. You can put it in a class, but you'll need to put in all the class features like package, class, constructor, and public/private markers

[eightballmark]

Ah ok, thanks for the help so far.

[eightballmark]

Hi again, I'm sure the answer to this is probably easy but I'm getting the following error.

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at LibPage/useMysteryNumber()

[5TonsOfFlax]

You are almost certainly calling useMysteryNumber before setting mainRef.

[eightballmark]

Ok, so I've abandoned OOP for the moment. I've just put everything inside the Main class and it's working fine so far.

Here's what I've done to make each room load up

function onLibButtonClick(event:MouseEvent):void
{
    if (1 == mysteryNumber){
    addChild(libPage1);
    removeChild(mapPage);
    }
    if (2 == mysteryNumber){
    addChild(libPage2);
    removeChild(mapPage);
    }
}

And here's what I'm using to back out of the room.

function onMapButtonClick(event:MouseEvent):void
    {
    addChild(mapPage);
    removeChild(this);
    }

Although it does work I'm getting this error:
ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.
at flash.display:isplayObjectContainer/removeChild()
at Main/onMapButtonClick()

Help?