var AgntUsr=navigator.userAgent.toLowerCase();
  var DomYes=(document.getElementById)?1:0;                                           // DOM
  var NavYes=(AgntUsr.indexOf('mozilla')!=-1&&AgntUsr.indexOf('compatible')==-1)?1:0; // Netscape
  var ExpYes=(AgntUsr.indexOf('msie')!=-1)?1:0;                                       // IExplorer
  var Opr5=(AgntUsr.indexOf('opera 5')!=-1||AgntUsr.indexOf('opera/5')!=-1)?1:0;      // Opera 5
  var DomNav=(DomYes&&NavYes)?1:0;                                                    // Netscape 6 up
  var DomExp=(DomYes&&ExpYes)?1:0;                                                    // IExplorer 5 up
  var Nav4=(NavYes&&!DomYes&&document.layers)?1:0;                                    // Netscape 4
  var IE4=(ExpYes&&!DomYes&&document.all)?1:0;                                        // IExplorer 4
  var PosStrt=((NavYes||ExpYes)&&!Opr5)?1:0;                                          // Can start
  var mac=(navigator.userAgent.indexOf("Mac")>-1)?1:0;