hilitec (ul_pccns)

	hilitec(irow.i4.v, icol.i4.v, ncols.i4.v)

	This routine highlights the field starting at IROW and ICOL
	and having a length of NCOLS by complementing the pixel
	values.  Two successive calls directed to the same field
	will restore the field to its original color values.

	This function requires the following include files: