/**
 * 
 *
 *
 */
function menu_exp(visible_element,sipka_span,dedeny_styl,barva_sipky) 
{
  var parse_element = document.getElementById(visible_element);
  var sipka_element = document.getElementById(sipka_span);
  //alert(parse_element.style.display);
  if ((!parse_element.style.display || parse_element.style.display == "none")) 
  {
    parse_element.style.display = "block";
    parse_element.parentNode.className = dedeny_styl;
    sipka_element.style.backgroundImage="url('/img/menu_"+barva_sipky+"_sipka_up.gif')";
  }
  else 
  {
     parse_element.style.display = "none";
     parse_element.parentNode.className = "menu_clean";
     sipka_element.style.backgroundImage="url('/img/menu_"+barva_sipky+"_sipka_down.gif')";
  }
}