var PocetMenu = 7;
function Show(CisMenu)    {
  var menu = document.getElementById('submenu'+CisMenu);	
  var menu2 = document.getElementById('menu'+CisMenu);	
  menu.style.visibility="visible";
  menu2.className="show";
}

function Hide() {
  var menu,menu2, i;
  for(i=1; i<=PocetMenu; i++) {
      menu = document.getElementById('submenu'+i);	
      menu.style.visibility="hidden";
	  menu2 = document.getElementById('menu'+i);	
      menu2.className="";
  }
}