var ver4 = (navigator.appVersion.charAt(0) >= "4");
var NN4 = ver4 && (navigator.appName.charAt(0) == "N");
var IE4 = ver4 && (navigator.appName.charAt(0) == "M");
var NC6 = (navigator.appVersion.charAt(0) >= "5");

if (NN4 || IE4 || NC6) {
var img_b = new Array();
	img_b[0] = new Image();  img_b[0].src = "images/navi01_off.gif";
	img_b[1] = new Image();  img_b[1].src = "images/navi01_on.gif";
	img_b[2] = new Image();  img_b[2].src = "images/navi02_off.gif";
	img_b[3] = new Image();  img_b[3].src = "images/navi02_on.gif";
	img_b[4] = new Image();  img_b[4].src = "images/navi03_off.gif";
	img_b[5] = new Image();  img_b[5].src = "images/navi03_on.gif";
	img_b[6] = new Image();  img_b[6].src = "images/navi04_off.gif";
	img_b[7] = new Image();  img_b[7].src = "images/navi04_on.gif";
	img_b[8] = new Image();  img_b[8].src = "images/navi05_off.gif";
	img_b[9] = new Image();  img_b[9].src = "images/navi05_on.gif";
	img_b[10] = new Image();  img_b[10].src = "images/navi06_off.gif";
	img_b[11] = new Image();  img_b[11].src = "images/navi06_on.gif";
	}

function b_on(nam,num){
	if(NN4 || IE4 || NC6)
	document.images[nam].src = img_b[num].src;
}

function b_out(nam,num){
	if(NN4 || IE4 || NC6)
	document.images[nam].src = img_b[num].src;
	return false;
}