I want to do a little X-ray routine, 

I tried using masks, with the different layers in order under the top layer,
but it seemed I couldn't move the mask.

I wrote a little Lingo to do what I wanted, but it is very slow and jerky
cos it uses the copy pixel command.

Any suggestions on how to do this properly/better?

Routine as is stands is this:

(n.b. "Windoh" is under a "target" both of which have the "Follow Mouse"
behaviour. The "outer skin" is on the stage with the "target" and "windoh"
moving over the top. "XRay2" is a cast member that is not currently on
stage, but represents the parts underneath the "outer skin")
====================================

on mousewithin me
  h1=sprite(3).left-sprite(2).left
  h2=sprite(3).left-sprite(2).left+member("windoh").width
  v1=sprite(3).top-sprite(2).top
  v2=sprite(3).top-sprite(2).top+member("windoh").height
member("windoh").image.copyPixels(member("xray2").image,
member("windoh").rect, rect(h1,v1,h2,v2))
end mousewithin
========================================
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