/* Skryvani, odkryvani podmenu */

function menu(menu,stav) {
   var ie4 = (document.all)? true:false;
   var ns4 = (document.layers)? true:false;
   var ns6 = (document.getElementById && !document.all)? true:false;
//   if (!ie4 && !ns6) return;
   if (stav == 1) {
      if (ie4) eval_str = "document.all.menu_" + menu +".style.visibility = \"visible\"";
      else if (ns4) eval_str = "document.menu_" + menu +".visibility = \"show\"";
      else if (ns6) { element = document.getElementById("menu_" + menu); eval_str = "element.style.visibility = \"visible\""; }
      eval(eval_str);
   } else {
      if (ie4) eval_str = "document.all.menu_" + menu +".style.visibility = \"hidden\"";
      else if (ns4) eval_str = "document.menu_" + menu +".visibility = \"hide\"";
      else if (ns6) { element = document.getElementById("menu_" + menu); eval_str = "element.style.visibility = \"hidden\""; }
      eval(eval_str);
   }
}