var ie = (document.all)? 1 : 0;
var usr = navigator.userAgent;
var objns6 = (usr.indexOf('Netscape6')!=-1)? 1 : 0;
var ns6 = (document.getElementById)? 1 : 0;
var isMac = (navigator.userAgent.indexOf('Mac')!=-1);
var brsr = (navigator.appName.indexOf("Netscape")!=-1);
var ns4 = (document.layers)? 1 : 0;