window.onload = function ()
{
  initGallery();
}
   
function initGallery ()
{
  var anchors = document.getElementsByTagName('a');
  for (var i=0; i<anchors.length; i++) {
    if (anchors[i].className == 'picnewin') {
        anchors[i].onclick = openNewGalleryWindow;
    };
  };
}

var okno, a;

function openNewGalleryWindow ()
{

  a = this;
  var w = a.firstChild.offsetWidth;
  var h = a.firstChild.offsetHeight;

  var params = w>h ? 'width=680, height=550' : 'width=550, height=680';
  okno = window.open('', 'gallery', params);
  setTimeout(fillGalleryWindow, 1);

  return false; 
}

function fillGalleryWindow () 
{
var link = okno.document.createElement('link');
  link.rel = 'stylesheet';
  link.href = '/site.css';
  okno.document.getElementsByTagName('head')[0].appendChild(link);
  
  okno.document.title = 'Obrázek';
  okno.document.body.innerHTML = '<p class="center"><img src="'+a.href+'" alt="'+a.firstChild.alt+'"><br />'+a.firstChild.alt+'<br /><a href="#" onclick="self.close(); return false;">zavřít okno</a></p>';

}