function dispDown(link) {
   var objectID = link + 'Up'
   var object = document.getElementById(objectID)
   object.style.visibility = "hidden"
   var objectID = link + 'Down'
   var object = document.getElementById(objectID)
   object.style.visibility = "visible"
}
function dispUp(link) {
   var objectID = link + 'Down'
   var object = document.getElementById(objectID)
   object.style.visibility = "hidden"
   var objectID = link + "Up"
   var object = document.getElementById(objectID)
   object.style.visibility = "visible"
}