function createMarker(lat, lon, caption, map, isOpened) {
        var point = new GLatLng(lat, lon);
    	var marker = new GMarker(point);
        GEvent.addListener(marker, "click", function() {
        marker.openInfoWindowHtml(caption);
        });
        map.addOverlay(marker);
	if (isOpened)
	{
		GEvent.trigger(marker,'click');
	}
}