JavaScript ActiveXObject using WScript.shell to run shutdown.exe command

I am trying to write a function using Java Script that utilizes an Active X control to shutdown a windows box.  The plan is to imbed this webpage as part of the active desktops on some windows lab machines so users will reboot when they are done with a machine.  Here is my code that I am having problems with:

 <SCRIPT LANGUAGE="JavaScript">
function reboot()  {
      var ws = new ActiveXObject("WScript.Shell");
      ws.Exec("shutdown.exe -r -t 30 -f -c Testing_Testing");

}
</script>

I basically want the users to see a little message when this function gets called by the button on the desktop.  I am having problems with the -c switch of the shutdown command.  I want to be able to write the message without the _ between each of the words.  Is there a way that I can type a message without the _ between each word?  I have tried using single quotes ' ' and brackets [] around the message and neither have worked.