var isNS4 = false;
var isIE4only = false;
var isIE45only = false;
var isIE4 = false;
var isNS6 = false;
var isMac = false;
var isOpera = false;
var hidden = "hidden"
var visible = "visible"
var dhtml = true;
var linux = false;
var noScroll = false;	// for those which don't support scrollbars on divs

if (navigator.appVersion.indexOf("Mac") > -1) isMac = true;
if (navigator.userAgent.indexOf("Konqueror") > -1) {
	linux = true;
	dhtml = false;
}
if (navigator.userAgent.indexOf("Linux") > -1) {
	linux = true;
}
if (navigator.userAgent.indexOf("Opera") > -1) {
	isOpera = true; 
	noScroll = true;
}

if (navigator.appVersion.charAt(0) < 4) dhtml = false;
else if (document.layers) {
	isNS4 = true;
	noScroll = true;
} else if (document.all) {
	isIE4 = true
	if (navigator.appVersion.indexOf("MSIE 4") > -1) isIE4only = true
	if (navigator.appVersion.indexOf("MSIE 4.5") > -1) {
		isIE45only = true
		noScroll = true
	}
} else if (document.getElementsByTagName("*")) isNS6 = true
else dhtml = false;