function check_applet() {
  if (document.applets.length > 0)
    return true
  else {
    alert('Please wait for SlideShow applet to start')
    return false
  }
}
function switch_config(configfilename) {
  if (check_applet) document.SlideShow.setAppletData(configfilename)
}
function get_ident () {
  if (check_applet) {
    s_item_ident = document.SlideShow.getItemIdent()
    if (s_item_ident != '')
      alert('ID string of displayed item is: ' + s_item_ident)
    else
      alert('Displayed item has no ID')
  }
}