/* Browser checkers */
var sTemp = navigator.userAgent.substr( 13, navigator.userAgent.length);

var isIE = sTemp.indexOf("MSIE") != -1;
var isNS = sTemp.indexOf("Netscape") != -1;
var isMoz = sTemp.indexOf("Moz") != -1;
var isSaf = sTemp.indexOf("Safari") != -1;

/* platform checkers */
var isWin = sTemp.indexOf("Win") != -1;
var isMac = sTemp.indexOf("Mac") != -1;
var isUnix = sTemp.indexOf("X11") != -1;

function show_page( pagepath) {
	if(isNS) {
		window.frames[0].document.location = pagepath;
	} else {
		frames[0].location = pagepath;
	}
}

function show_layer( layername) {
	document.getElementById(layername).style.visibility='visible';
}

function hide_layer( layername) {
	document.getElementById(layername).style.visibility='hidden';
}