function openwin(link, menubar, width, height)
{
  str = '"menubar=no,';
  if (menubar == "yes") str += ' scrollbars=yes,';
  str += ' width=' + width + ', height=' + height + '"';
  win = window.open(link, "", str);
  win.moveTo(screen.availWidth/2 - width/2, screen.availHeight/2 - height/2);
}

function show(photo, w, h)
{
  var doc = document.body;
  var win = document.all['img_win'];
  var top = doc.scrollTop + doc.clientHeight/2 - h/2;

  if (top < 0) top = 0;
  win.style.top = top;

  win.style.left = doc.clientWidth/2 - w/2;
  win.style.visibility = 'visible';

  img.src = '/img/1x1.gif';
  img.width = w;
  img.height = h;
  img.src = photo;
}

function hide()
{
  document.all['img_win'].style.visibility = 'hidden';
  img.width = 0;
  img.height = 0;
  img.src = '/img/1x1.gif';
}