if (document.images) {
	
	var arrowon = new Image(); arrowon.src = "../img/sub_arrowb.gif";
	var arrowoff = new Image(); arrowoff.src = "../img/sub_arrow.gif";
	var doton = new Image(); doton.src = "../img/sub_dotb.jpg";
	var dotoff = new Image(); dotoff.src = "../img/sub_dot.jpg";
	
}

function actarrow(imgN) {
	if (document.images) document[imgN].src = arrowon.src;
}

function inactarrow(imgN) {
	if (document.images) document[imgN].src = arrowoff.src;
}

function actdot(imgN) {
		if (document.images) document[imgN].src = doton.src;
}

function inactdot(imgN) {
		if (document.images) document[imgN].src = dotoff.src;
}