function navBar_item (img_name, width, height) {
	img_str = "./img/" + img_name;

	this.img_name_off = new Image (width, height);
	this.img_name_off.src = img_str + "_off.gif";
	this.img_name_on = new Image (width, height);
	this.img_name_on.src = img_str + "_on.gif";
}

function new_navBar_item (img_name, width, height) {
	navBar_item [img_name] = new navBar_item (img_name, width, height);
}

function navBarOver (img_name) {
	if (nn4) {
		document.layers['bg'].document.layers['leftPane'].document.images[img_name].src = navBar_item[img_name].img_name_on.src;
	} else {
		document.images[img_name].src = navBar_item [img_name].img_name_on.src;
	}
}

function navBarOut (img_name) {
	if (nn4) {
		document.layers['bg'].document.layers['leftPane'].document.images[img_name].src = navBar_item[img_name].img_name_off.src;
	} else {
		document.images[img_name].src = navBar_item [img_name].img_name_off.src;
	}
}

if (ver4) {
	new_navBar_item ("port", 157, 35);
	new_navBar_item ("prod", 157, 35);
	new_navBar_item ("work", 157, 35);
	new_navBar_item ("serv", 157, 35);
	new_navBar_item ("about", 157, 35);
}