var InternetExplorer = navigator.appName.indexOf("Microsoft") != -1;
function powerbullet_DoFSCommand(command, args) { 
  var map = InternetExplorer ? powerbullet : document.powerbullet; 
  if (command=="home" ) 
    map.Rewind(); 
  else if ( command=="zoom" ) 
    map.Zoom(parseInt(args)); 
   else if (command == "message") 
    alert(args);
   else if (command == "pan") 
    map.Pan(parseInt(args)); 
   else if (command == "parse") 
    eval(args); 
}

Sub powerbullet_FSCommand(ByVal command, ByVal args);
  call powerbullet_DoFSCommand(command, args);
end sub