function ShowSubMenu(MenuId)
{
  HideAllSubMenus();
  if(MenuId == MenuMarketing)
  {
    SubMenuMarketing.style.display='inline';
  }
  else if(MenuId == MenuProdukty)
  {
    SubMenuProdukty.style.display='inline';
  }
}

function HideSubMenu(MenuId)
{
  if(MenuId == MenuMarketing)
  {
    SubMenuMarketing.style.display='none';
  }
  else if(MenuId == MenuProdukty)
  {
    SubMenuProdukty.style.display='none';
  }
}

function HideAllSubMenus()
{
  HideSubMenu(MenuMarketing);
  HideSubMenu(MenuProdukty);
}