function detaily($id){

  if (document.getElementById($id).style.display == 'none'){
    document.getElementById($id).style.display ='block';  
  } 
  else {
    document.getElementById($id).style.display ='none'; 
  }
}

window.onload = function() {
    incMenu();
}

function incMenu() {
    var menuBg = new Image();
    var old_hover;

    var menuContent = document.getElementById("menuContent");
    var polozky = menuContent.getElementsByTagName("a");
    
    for (var i = 0; i < polozky.length; i++) {
        polozky[i].onmouseover = function() {
            var span = this.getElementsByTagName("span")[0];
            old_hover = span.className;
            span.className = "odrazka oHover";
        }
        polozky[i].onmouseout = function() {
            if (old_hover == "odrazka oNorm") {
                var span = this.getElementsByTagName("span")[0];
                span.className = "odrazka oNorm";
            }
        }
    }
    
    // buttony pod menu
    var buttons = document.getElementById("buttons");
    var ramecky = buttons.getElementsByTagName("a");

    for (var i = 0; i < ramecky.length; i++) {
        ramecky[i].onmouseover = function() {
            var obdelnicek = this.getElementsByTagName("span")[2];
            obdelnicek.className = "odrazka_button bHover";
        }

        ramecky[i].onmouseout = function() {
            var obdelnicek = this.getElementsByTagName("span")[2];
            obdelnicek.className = "odrazka_button bNorm";
        }
    } 
}