function openVideo(url) {
  popupWin = window.open(url, 'video', 'location=no,status=yes,resizable=no,menubar=no,toolbar=no,directories=no,scrollbars=no,width=390,height=360');
}
function swap(id) {
 if (document.getElementById(id).style.display != "block") {
   document.getElementById(id).style.display = "block";
 }
 else { 
   document.getElementById(id).style.display = "none";
 }
}
function show(id) {
   document.getElementById(id).style.display = "block";
 }
function hide(id) {
   document.getElementById(id).style.display = "none";
 }