function toggle(id)
  { var obj = document.getElementById(id)
    if (!obj) return
    var img = document.getElementById(id + '_plus')
    if (obj.style.display == 'none')
    { obj.style.display = 'block'
      if (img) img.src = 'images/minus.gif'
    } else {
      obj.style.display = 'none'
      if (img) img.src = 'images/plus.gif'
    }
  }
  function display(id)
  { var obj = document.getElementById(id)
    obj.style.display = 'block'
  }  
function hide(id)
  { var obj = document.getElementById(id)
    obj.style.display = 'none'
  }
function openwin(title)
{ var options = 'height=375, width=450'
  window.open('/videos/popupvideo.html',title,options)
}