Can you force the bg of a button to a spicific layer?

Question

Ok, shot in the dark here? I am trying to get a button to
always show the bottom layer as its background. For example:
lets say I have 4 layers
0: photo
1: blue
2: green
3: yellow
each layer is stacked on top of the next and each takes up
1/4 of the frame.
[ 0 ][ 1 ][ 2 ][ 3 ]
I have a button on each layer.
I want the background of each button to show the section of
the photo( on layer 0 ) it resides over.... so as the button moves
you see the image under all the layers.
Thanks

Answer 1

I think I may understand what you are trying to do now....
Let me put it in my own words to see that I really do...
[Button1] [Button2] [Button3]
Image is buried underneath all of these. When I rollover
button1, the image underneath will show but all i'll see if the
area of the image directly beneath it on the stage... This is
definitely masking...
If this is what you're after, here's what I'd do...
Create another layer directly above the image. Create a new
shape on the stage that is the size of the image you want to have
show (probably the size of your buttons). Turn that shape into a
movie clip and give it an instance name of mask. Select the layer
this image is on and make it a mask (right click and select mask).
This mask can be moved when you rollOver a given button...
button1.onRollOver = moveMask(button1._x, button1._y);
button2.onRollOver = moveMask(button2._x, button2._y);
button3.onRollOver = moveMask(button3._x, button2._y);
function moveMask(x:Number, y:Number):Void {
mask._x = x;
mask._y = y;
is this what you are after?