;+
; NAME: checkargnum
; 	checks that the parent routine actually had the right number of args 
; 	passed to it.
;
; INPUTS:
;	nparams		the output of N_params() for the calling routine
;	nrequired	how many params are required
;	usagestring	the string to print if there are too few args
;
; HISTORY:
; 	Began 2002-03-30 17:58:12 by Marshall Perrin 
; -

PRO checkargnum,nparams,nrequired,usagestring

  if nparams LT nrequired then begin  
        print,"Incorrect number of arguments."
        print,'Syntax: '+usagestring
		stop
        return
  endif


end