function overlay, arg1, arg2

stuff= size(arg1)
fsize= stuff(2)
n= stuff(3)
themov= bytarr(fsize, fsize, n)

window, 1, xsize= fsize, ysize= fsize, /pixmap

for i=0, n-1 do begin
  tv, reverse(arg1(*,*,i),2) or reverse(arg2(*,*,i),2)
  print,"Frame... ",i
  themov(*,*,i)= tvrd()
endfor

wdelete,1

return, themov

end