function demo()
{
 var ie = 0;
 var vie = 0;
 var browser=navigator.userAgent;
 
 if ((browser.indexOf("MSIE")<0) || (browser.indexOf("Opera")>0))
   window.location.href="html/demo_iebe.htm";
 else {
   browser=browser.split("; ")[1];
   var version=parseFloat(browser.substring(5,10));
  
   if (version<6)
     ie = 0;
   else
     ie = 1;
      
   try {
     var xObj = new ActiveXObject("AdView.Adviewer");
     viewerInstalled = true;
   }
   catch (e) { viewerInstalled = false; }
   viewerInstalled ? vie = 1 : vie = 0;
   
   if ( ie == 1 && vie == 1 )
     window.location.href="html/demo.htm";
     
   if ( ie == 1 && vie == 0 )
     window.location.href="html/demo_dwf.htm";
     
   if ( ie == 0 && vie == 1 )
     window.location.href="html/demo_ie.htm";
     
   if ( ie == 0 && vie == 0 )
     window.location.href="html/demo_ie_dwf.htm";
 }
}