function GetId(id_zm)
  {
     var id_x = false;
     if (typeof(document.getElementById) != 'undefined')
     {
        id_x=document.getElementById(id_zm);
     }
     else
     {
        if (typeof(document.all) != 'undefined')
        {
           id_x=document.all[id_zm];
        }
     }
     return id_x;
  }
  
//------------------------------------------------- Menu rozwijane --------------------------------------------
  var ImageMenuKwadrat = new Array(5);
  for (var n=0; n<5; n++) ImageMenuKwadrat[n] = new Image();
  ImageMenuKwadrat[0].src='./img/menu_plus.gif';
  ImageMenuKwadrat[1].src='./img/menu_minus.gif';
  ImageMenuKwadrat[2].src='./img/menu_wezel.gif';
  ImageMenuKwadrat[3].src='./img/menu_pion.gif';
  ImageMenuKwadrat[4].src='./img/menu_poziom.gif';

  function Menu_OpenLeftSubMenu(id_div, prefix)
  {
     var element = GetId(prefix + 'menu_left_full_' + id_div);
     var img_kwadrat = GetId(prefix + 'menu_left_img_'+id_div);
     var los = Math.round(2147483647 * Math.random());
     var obrazek = new Image();
     if (element.style.display=='none')
     {
        element.style.display = 'block';
        img_kwadrat.src = './img/menu_minus.gif';
        obrazek.src = './main_menu_open.php?st=1&id=' + id_div + '&r=' + los;
     }
     else
     {
        element.style.display = 'none';
        img_kwadrat.src = './img/menu_plus.gif';
        obrazek.src = './main_menu_open.php?st=0&id=' + id_div + '&r=' + los;
     }
     delete obrazek;
  }
//------------------------------------------------- Menu rozwijane --------------------------------------------

function setlang(nr)
{
 if ((nr < 1) || (nr > 5)) nr = 1;
 document.cookie = 'lang_set=' + nr; 
 location.href="index.php?lan="+nr;
 //location.href=location.href;
}