function ShowGallery(folder,file)
{
  if(!folder) return;
  var m = document.getElementById("mask");
  var pc = document.getElementById("gallery_container");
  var pf = document.getElementById("gallery_frame");
  if(!m || !pc  || !pf) return; 
  pf.src = "gallery.aspx?folder=" + folder + "&file=" + file;
  m.style.display = "";
  pc.style.display = "";
}

function HideGallery()
{
  var m = window.parent.document.getElementById("mask");
  var pc = window.parent.document.getElementById("gallery_container");
  var pf = window.parent.document.getElementById("gallery_frame");
  if(!m || !pc || !pf ) return;
  m.style.display = "none";
  pc.style.display = "none";
  pf.src = "about:blank";
}