function brDetection() {
		var brAgent = navigator.userAgent.toLowerCase();
		this.brVer = parseInt(navigator.appVersion);
		this.brVerDot = parseFloat(navigator.appVersion);
		this.ns = ((brAgent.indexOf('mozilla') != -1) && ((brAgent.indexOf('spoofer') == -1) && (brAgent.indexOf('compatible') == -1)));
			this.ns2 = (this.ns && (this.brVer == 3));
			this.ns3 = (this.ns && (this.brVer == 3));
			this.ns4b = (this.ns && (this.brVerDot < 4.04));
			this.ns4 = (this.ns && (this.brVer >= 4));
			this.ie = (brAgent.indexOf("msie") != -1);
			this.ie3 = (this.ie && (this.brVer <= 3));
			this.ie4 = (this.ie && (this.brVer == 4));
			this.ie5 = (this.ie && (this.brVer >= 5));
		this.op = (brAgent.indexOf("opera") != -1);
		this.mac = (brAgent.indexOf("mac") != -1);
		this.win = (brAgent.indexOf("win") != -1);
		this.unix = (brAgent.indexOf("x11") != -1);
	}
	var brID = new brDetection();
	if (brID.mac) {
		document.write ('<link rel="stylesheet" type="text/css" href="css/macStyles.css">')
	}
	if ((brID.win) && (brID.ns4)) {
		document.write ('<link rel="stylesheet" type="text/css" href="css/winNSStyles.css">')
	}
	if ((brID.win) && (brID.ie)) {
		document.write ('<link rel="stylesheet" type="text/css" href="css/winIEStyles.css">')
	}


// preload images
function preloadImages() {
	var d = document;
	if (d.images) {
		if (!d.p) d.p = new Array();
		var i, j = d.p.length, a = preloadImages.arguments;
		for (i = 0; i < a.length; i++)
		if (a[i].indexOf("#")) {
			d.p[j] = new Image();
			d.p[j++].src = a[i];
		}
	}
}

// find object
function findObj(n,d) {
	var p, i, x;
	if (!d) d = document;
	if ((p = n.indexOf("?")) > 0 && parent.frames.length) {
		d = parent.frames[n.substring(p+1)].document;
		n = n.substring(0,p);
	}
	if (!(x = d[n]) && d.all) x = d.all[n];
	for (i = 0; !x && i < d.forms.length; i++)
	x = d.forms[i][n];
	for (i = 0; !x && d.layers && i < d.layers.length; i++)
	x = findObj(n,d.layers[i].document);
	return x;
}

// swap image
function swapImage() {
	var i, j = 0, x, a = swapImage.arguments;
	document.sr = new Array;
	for (i = 0; i < (a.length - 2); i += 3)
	if (x = findObj(a[i])) {
		document.sr[j++] = x;
		if (!x.oSrc) x.oSrc = x.src; x.src = a[i+2];
	}
}


// swap image restore
function swapImgRestore() {
	var i, x, a = document.sr;
	for (i = 0; a && i < a.length && (x = a[i]) && x.oSrc; i++)
	x.src = x.oSrc;
}

preloadImages(
	'images/navi/navi01on.gif',
	'images/navi/navi02on.gif',
	'images/navi/navi03on.gif',
	'images/navi/navi04on.gif',
	'images/navi/navi05on.gif',
	'images/navi/navi06on.gif',
	'images/navi/navi07on.gif',
	'images/navi/navi08on.gif',
	
	'images/navi/navi_about01on.gif',
	'images/navi/navi_about03on.gif',
	'images/navi/navi_map06on.gif',
	'images/navi/navi_map08on.gif',
	'images/navi/navi_partner05on.gif',
	'images/navi/navi_partner07on.gif',
	'images/navi/navi_profile04on.gif',
	'images/navi/navi_profile06on.gif',
	'images/navi/navi_solut02on.gif',
	'images/navi/navi_solut04on.gif',
	'images/navi/navi_work03on.gif',
	'images/navi/navi_work05on.gif',
	'images/common/icon_topon.gif'
);