var currentSelVideoContent = 'v_0';
function changeVideoContent(theId) {
  document.getElementById(currentSelVideoContent).style.display = 'none';
  document.getElementById(theId).style.display = '';
  currentSelVideoContent = theId;
}

function changeContent(showId, hideId) {
  document.getElementById(hideId).style.display = 'none';
  document.getElementById(showId).style.display = '';
}

function wopen(url)
{
  document.location.href=url;
  /*w=800;
  h=500;
  // Fudge factors for window decoration space.
  // In my tests these work well on all platforms & browsers.
  w += 32;
  h += 110;
  wleft = (screen.width - w) / 2;
  wtop = (screen.height - h) / 2;
  var win = window.open(url,
    name,
    'width=' + w + ', height=' + h + ', ' +
    'left=' + wleft + ', top=' + wtop + ', ' +
    'location=no, menubar=no, ' +
    'status=no, toolbar=no, scrollbars=yes, resizable=yes');
  // Just in case width and height are ignored
  win.resizeTo(w, h);
  // Just in case left and top are ignored
  win.moveTo(wleft, wtop);
  win.focus();*/
}