var bPageLoad = true;

    function PlayArchive(strFile)
    {
      mainform.mp.url = strFile;
      mainform.mp.controls.play()
    }

    function OpenWindow(url, name, parms)
    {
      if (bPageLoad)
      {
        window.open(mainform.servername.value + url,name,parms)
      }  
      else
      {
        bPageLoad = true
      }
    }