pro plusmark,x,y,color=color,thick=thick,big=big

;+
; NAME
;	plusmark
; PURPOSE
;	Plot a tiny cross at the specified place on a window.
; CALLING SEQUENCE
;	plusmark,x,y[,color=color,thick=thick,big=big
; INPUT
;	x,y - The pixel location of the desired position of the cross.
; OPTIONAL KEYWORD INPUT
;	color - color of the cross, default is 255.
;	thick - line thickness of the cross, default=1.0
;	big - size of the cross, default = 7 pixels.
; HISTORY
;	LWA, 22-Jun-94
;	LWA, added keywords thick and big.  1-Nov-94
;-

if NOT keyword_set(color) then color=255 else color=color
if NOT keyword_set(thick) then thick=1.0  else thick=thick
if NOT keyword_set(big) then big=3  else big=big

         plots, [x-big,x+big],[y,y],/device,color=color,thick=thick
         plots, [x,x],[y-big,y+big],/device,color=color,thick=thick

end