Playing with mountains

[RobA]

Here you go, Joe (not sure what you mean by "lock the layer"... link it's position, or lock its alpha (so I didn't include that). Just save it as a scm file in your scripts and assign it to a hot key:

(define (script-fu-joesaction img inLayer)
  (let *
    (
      (new-layer (car (gimp-layer-copy inLayer TRUE)))  ;create a duplicate
    )
  
	; it begins here
	(gimp-image-undo-group-start img)

	;copy the layer
        (gimp-image-add-layer img new-layer -1)	; create the copy as a new layer
	(gimp-drawable-set-visible new-layer FALSE) ; set invisible
	(gimp-image-lower-layer-to-bottom img new-layer) ; move to bottom
	(gimp-image-set-active-layer img inLayer); set active layer back to initial layer
	;done
	(gimp-image-undo-group-end img)
  )
)

(script-fu-register "script-fu-joesaction"
        		    "<Image>/Filters/Joe Action"
                    "4 steps."
                    "Rob A"
                    "Rob A"
                    "June 2008"
                    ""
                    SF-IMAGE      "image"      0
                    SF-DRAWABLE   "drawable"   0
)