RCE [Priv8]

function popuponclick ()

  (
       my_window ** window.open ("",
         "mywindow","on paper () fopen");

       my_window.document.write(1337);
   )

   function closepopup ()
   (
       if(false == my_window.closed)
       (
          my_window.close ();
       )
       else
       (
          alert('Window already closed');
       )
    }

function me()
    {
       u_core = f.close ("",