if (document.layers) {
	// nav4 CSS
	document.write('<link rel="stylesheet" type="text/css" href="css/nav4.css" >');
} else if (isIE4win()) {
	// IE4 CSS
    document.write('<link rel="stylesheet" type="text/css" href="css/ie4.css" >');
}

// open link in new window
function nw(a) {
	window.open(a.href,'popUpWin');	return false;
}

// open link in "chromeless" window
function nwNC(a, left, top, width, height)
{
	popUpWin = window.open(a.href, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top); return false;
}

function isIE4win() {
	var ua = navigator.userAgent.toLowerCase(); 
	var isOpera = (ua.indexOf('opera') != -1); 
	var isIE    = (ua.indexOf('msie') != -1 && !this.isOpera && (ua.indexOf('webtv') == -1) );
	if (!isIE) return false;
	if (ua.indexOf('win') == -1) return false;
	var versionMinor = parseFloat(navigator.appVersion); 
	if (versionMinor >= 4) versionMinor = parseFloat( ua.substring( ua.indexOf('msie ') + 5 ) );
	return (parseInt(versionMinor) == 4);
}