function g(name)
  {
   var element = document.getElementById(name);
   return element;
  }

  function obrGalerie(sender)
  {
    subor = sender;
    winW = document.body.offsetWidth;
    winH = screen.height;
    if (document.body.offsetHeight>winH) winH=document.body.offsetHeight;
    vyska = winH+"px";
    g("nahlad1pod").style.height = vyska;
    g("nahlad1pod").style.display = "block";
    g("nahlad1").style.display = "block";

    htmlt = '<a href="javascript:obrGalerieS();">';
    htmlt = htmlt+'<img src="'+subor+'"  class="img1" alt="" /></a>';
    g("nahladobr").innerHTML = htmlt;
  }

  function obrGalerieS()
  {
   g("nahlad1").style.display = "none";
   g("nahlad1pod").style.display = "none";
   g("videos1").style.display = "block";
  }