var img_menu = new Array();
var img_menu_ = new Array();
img_menu[0] = new Image();
img_menu[0].src='img/m_onas.jpg';
img_menu_[0] = new Image();
img_menu_[0].src='img/m_onas_.jpg';
img_menu[1] = new Image();
img_menu[1].src='img/m_miasto.jpg';
img_menu_[1] = new Image();
img_menu_[1].src='img/m_miasto_.jpg';
img_menu[2] = new Image();
img_menu[2].src='img/m_kronika.jpg';
img_menu_[2] = new Image();
img_menu_[2].src='img/m_kronika_.jpg';
img_menu[3] = new Image();
img_menu[3].src='img/m_wydawnictwa.jpg';
img_menu_[3] = new Image();
img_menu_[3].src='img/m_wydawnictwa_.jpg';
img_menu[4] = new Image();
img_menu[4].src='img/m_linki.jpg';
img_menu_[4] = new Image();
img_menu_[4].src='img/m_linki_.jpg';
img_menu[5] = new Image();
img_menu[5].src='img/m_kontakt.jpg';
img_menu_[5] = new Image();
img_menu_[5].src='img/m_kontakt_.jpg';



function change_menu(img, id, tmp) {
  if (tmp=='_')
   img.src=img_menu_[id].src;
  else
   img.src=img_menu[id].src;
 }
 
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";
   }
}