function Show(id)
{
  var item = null;

  if (document.getElementById) item = document.getElementById(id);
  else if (document.all) item = document.all[id];
  else if (document.layers) item = document.layers[id];

  if (item) if (item.style) item.style.display = "";
}

function Hide(id)
{
    var item = null;

  if (document.getElementById) item = document.getElementById(id);
  else if (document.all) item = document.all[id];
  else if (document.layers) item = document.layers[id];

  if (item) if (item.style) { item.style.display = "none"; }
}

function ShowOrHide(id)
 {

  var item = null;
  if (document.getElementById) item = document.getElementById(id);
  else if (document.all) item = document.all[id];
  else if (document.layers) item = document.layers[id];
  if (!item){  }
   else if (item.style)
   {
    if (item.style.display == "none") item.style.display = "";
    else item.style.display = "none";
   }
   else
   {
    item.visibility = "show";
   }
}

function change_img(x,y) {
  document.images[x].src='./grafika/'+y+'.gif';
 }
 
function menu1_show()
{
    document.getElementById("A1").style.backgroundImage="url(\"\")";
    document.getElementById("A2").style.backgroundImage="url(\"\")";
    document.getElementById("A3").style.backgroundImage="url(\"\")";
    Show('aktual'); Hide('pozostale'); Hide('parafia');
}

function tyl1_on(link)
{
    document.getElementById("A1").style.backgroundImage="url(\"\")";
    document.getElementById("A2").style.backgroundImage="url(\"\")";
    document.getElementById("A3").style.backgroundImage="url(\"\")";
    link.style.backgroundImage="url(\"./grafika/button.png\")";
}

function menu2_show()
{
    document.getElementById("B1").style.backgroundImage="url(\"\")";
    document.getElementById("B2").style.backgroundImage="url(\"\")";
    document.getElementById("B3").style.backgroundImage="url(\"\")";
    document.getElementById("B4").style.backgroundImage="url(\"\")";
    document.getElementById("B5").style.backgroundImage="url(\"\")";
    document.getElementById("B6").style.backgroundImage="url(\"\")";
    Show('parafia'); Hide('aktual'); Hide('pozostale');
}
function tyl2_on(link)
{
    document.getElementById("B1").style.backgroundImage="url(\"\")";
    document.getElementById("B2").style.backgroundImage="url(\"\")";
    document.getElementById("B3").style.backgroundImage="url(\"\")";
    document.getElementById("B4").style.backgroundImage="url(\"\")";
    document.getElementById("B5").style.backgroundImage="url(\"\")";
    document.getElementById("B6").style.backgroundImage="url(\"\")";
    link.style.backgroundImage="url(\"./grafika/button.png\")";
}
function menu3_show()
{
    document.getElementById("C1").style.backgroundImage="url(\"\")";
    document.getElementById("C2").style.backgroundImage="url(\"\")";
    document.getElementById("C3").style.backgroundImage="url(\"\")";
    document.getElementById("C4").style.backgroundImage="url(\"\")";
    Show('pozostale'); Hide('aktual'); Hide('parafia');
}
function tyl3_on(link)
{
    document.getElementById("C1").style.backgroundImage="url(\"\")";
    document.getElementById("C2").style.backgroundImage="url(\"\")";
    document.getElementById("C3").style.backgroundImage="url(\"\")";
    document.getElementById("C4").style.backgroundImage="url(\"\")";
    link.style.backgroundImage="url(\"./grafika/button.png\")";
}