var Mac = navigator.appVersion.indexOf('Mac',0) != -1;
var Win = navigator.appVersion.indexOf('Win',0) != -1;
var NN = navigator.appName.indexOf('Netscape',0) != -1;
var IE = navigator.appName.indexOf('Microsoft Internet Explorer',0) != -1;
var Version = navigator.appVersion.charAt(0); 
if(navigator.appVersion.indexOf('MSIE 5',0) != -1){Version++;}
var isNav4,isIE4,isNav6;
if(parseInt(navigator.appVersion.charAt(0)) >= 4){
	isNav4=(document.layers)? true : false;
	isNav6=(document.getElementById&&!document.all)? true : false;
	isIE4=(document.all)? true : false;
}