function openPassageRoute( departureDate, passageNumber, station_from, station_to )
	{
		href =   "passage_route.php?departure_date=" + departureDate 
		       + "&passage_number=" + passageNumber 
		       + "&from=" + station_from 
		       + "&to=" + station_to 
			   + "&source=passages";

        var width = 850;
        var height = 600;
        var left  = ( screen.width - width ) / 2;
        var top   = ( screen.height - height ) / 2;
	
	    var w = open( href, '_blank', "resizable,scrollbars,width=" + width + ",height=" + height + ",left=" + left + ",top=" + top );
	    w.focus();
	}