function Is ()

{   // convert all characters to lowercase to simplify testing
    var agt=navigator.userAgent.toLowerCase()

    // *** BROWSER VERSION ***
    this.major = parseInt(navigator.appVersion)
    this.minor = parseFloat(navigator.appVersion)

    this.nav  = ((agt.indexOf('mozilla')!=-1) && ((agt.indexOf('spoofer')==-1)
                && (agt.indexOf('compatible') == -1)))
    this.nav2 = (this.nav && (this.major == 2))
    this.nav3 = (this.nav && (this.major == 3))
    this.nav4 = (this.nav && (this.major == 4))
    this.navonly      = (this.nav && (agt.indexOf(";nav") != -1))
    this.ie   = (agt.indexOf("msie") != -1)
    this.ie3  = (this.ie && (this.major == 2))
    this.ie4  = (this.ie && (this.major == 4))

    this.opera = (agt.indexOf("opera") != -1)
  
    // *** JAVASCRIPT VERSION CHECK *** 
    // Useful to workaround Nav3 bug in which Nav3 
    // loads <SCRIPT LANGUAGE="JavaScript1.2">.

    if (this.nav2 || this.ie3) this.js = 1.0
    else if (this.nav3 || this.opera) this.js = 1.1
    else if (this.nav4 || this.ie4) this.js = 1.2
    // NOTE: In the future, update this code when newer versions of JS 
    // are released. For now, we try to provide some upward compatibility 
    // so that future versions of Nav and IE will show they are at 
    // *least* JS 1.2 capable. Always check for JS version compatibility 
    // with > or >=.
    else if ((this.nav && (this.minor > 4.05)) || (this.ie && (this.major > 4))) 
         this.js = 1.2
    else this.js = 0.0 // HACK: always check for JS version with > or >=

}

noJavaText = "Для просмотра панорамы требуется броузер с включенной поддержкой Java. <P>" +
      "Рекомендуем использовать последние версии броузеров " +
      "<a href='http://home.netscape.com/computing/download/index.html'>Netscape</a>" + 
      " или <a href='http://www.microsoft.com/windows/ie/'>Microsoft</a>.<br>" 

var is = new Is();


if (!is.ie3){
 if(!navigator.javaEnabled()){
   document.write(noJavaText)
 }
}