var usr = navigator.userAgent ;
var av = navigator.appVersion
var ns4 = (document.layers)? 1 : 0 ;
var ie = (document.all)? 1 : 0 ;
var ie5 = (ie && av >= 5 ) ;
//alert (av) 
var objns6 = (usr.indexOf('Gecko')!=-1)? 1 : 0 ;
//var objns6UP = (navigator.userAgent.indexOf("Mozilla")!=-1);
var ns6 = ((document.getElementById)&&(objns6))? 1 : 0 ;
var isMac = (navigator.userAgent.indexOf('Mac')!=-1) ;
var brsr = (navigator.appName.indexOf("Netscape")!=-1) ;
var mozz = (navigator.userAgent.indexOf("Opera"||"Mozilla")!=-1);

var XDom = ( ns6 || ie ) ;  // 5