var usr = navigator.userAgent ;
var av = navigator.appVersion
var ns4 = (document.layers)? 1 : 0 ;
var IE = (document.all)? 1 : 0 ;

var objNS = (usr.indexOf('Gecko')!=-1)? 1 : 0 ;
var NS = ((document.getElementById)&&(objNS))? 1 : 0 ;
var isMac = (navigator.userAgent.indexOf('Mac')!=-1) ;
var netscape = (navigator.appName.indexOf("Netscape")!=-1) ;
var mozz = (navigator.userAgent.indexOf("Opera"||"Mozilla")!=-1);