function off(menunum)
  {
	var currentimg = document.getElementById(menunum + "img");
    currentimg.style.background = 'url(/images/pos.jpg) no-repeat';
    var currentmenu = document.getElementById(menunum + "block");
    var time = currentmenu.style.display = 'none';
  }

  function on(menunum)
  {
	var currentimg = document.getElementById(menunum + "img");
    currentimg.style.background = 'url(/images/neg.jpg) no-repeat';
    var currentmenu = document.getElementById(menunum + "block");
    currentmenu.style.display = 'block';
  }