var N = 10;
var selected = 0;
var normal = new Array();
var over = new Array();
var down = new Array();

if (document.images){
	for (i=1; i<=N; i++) {
		normal[i] = new Image(); normal[i].src = "img/menu/m" + i + ".gif";
		over[i] = new Image(); over[i].src = "img/menu/m" + i + "over.gif";
		down[i] = new Image(); down[i].src = "img/menu/m" + i + "down.gif";
	}
}

function on(imagenum) {
	if ((document.images)&&(imagenum!=selected)) {
		document.images["m" + imagenum].src = over[imagenum].src;
	}
}

function off(imagenum) {
	if ((document.images)&&(imagenum!=selected)) {
		document.images["m" + imagenum].src = normal[imagenum].src;
	}
}

function active(imagenum) {
	if ((document.images)&&(imagenum!=0)) {
		document.images["m" + imagenum].src = down[imagenum].src;
		selected = imagenum;
	}
}