var id_img_save = 0;
//function med(img_name, no_img) {
//  var source = "./images/medium/" + img_name + ".jpg";
//  document.getElementById('id_med').src = source;
//  
//  document.getElementById('id_large').href = "./images/large/" + img_name + ".jpg";
//  var titulek = document.getElementById('id_desc_'+no_img).innerHTML;
//  if (titulek)
//    titulek = titulek;
//  else
//    titulek = " ";
//  document.getElementById('id_large').title = titulek;
//  document.getElementById('id_med').alt = titulek;
//  
//  document.getElementById('id_desc_'+ id_img_save).style.display = "none";
//  document.getElementById('id_desc_'+ no_img).style.display = "";
//  
//  document.getElementById('img_no_' + id_img_save).style.background = "#dcdcdb";
//  document.getElementById('img_no_' + no_img).style.background = "#c4e541";
//  id_img_save = no_img;
//  document.getElementById('id_img').value = source;
//}

function med(img_name, id_img) {
	document.getElementById('large_'+id_img_save).style.display = 'none';
	document.getElementById('large_'+id_img).style.display = 'block';
	
  document.getElementById('img_no_' + id_img_save).style.background = "#dcdcdb";
  document.getElementById('img_no_' + id_img).style.background = "#c4e541";

	id_img_save = id_img;
}