function showSubMenu(id) {
  hideMenu();
  document.getElementById('smenu'+id).style.display = "block";
  document.getElementById('menu'+id).className = "act";
  var Img = document.getElementById('menu'+id).getElementsByTagName('img');
  Img[0].style.display = "block";
}

function hideMenu() {
  var arrayOfImgs = document.getElementById('menu').getElementsByTagName('img');
  for(i in arrayOfImgs ){
	if (i < arrayOfImgs.length) arrayOfImgs[i].style.display = "none";
  }

  var arrayOfdiv = document.getElementById('menu').getElementsByTagName('div');
  for(i in arrayOfdiv ){
    if (arrayOfdiv[i].className=="menu2") arrayOfdiv[i].style.display = "none";
	if (arrayOfdiv[i].className=="menu1") {
		var arrayOfMdiv = arrayOfdiv[i].getElementsByTagName('div');
		for(j in arrayOfMdiv ){
			arrayOfMdiv[j].className = "";
		}
	}
  }

  document.getElementById('menu_angle').style.display = "block";
}