function menuhide(menunum)
  {
    var currentmenu = document.getElementById("menubody" + menunum);
    currentmenu.style.visibility = 'hidden';
  }

  function menushow(menunum)
  {
    var currentmenu = document.getElementById("menubody" + menunum);
    currentmenu.style.visibility = 'visible';
  }
  
  function change(id)
  {
    var s = document.getElementById(id).src;
	document.getElementById(id).src = s.replace(/.gif/g, "_on.gif");
  }
  
  function changeback(id)
  {
    var s = document.getElementById(id).src;
	document.getElementById(id).src = s.replace(/_on.gif/g, ".gif");
  }
  
  function changebg(id)
  {
	var s = "url(\'menu/" + id + "_on.gif\')";
	document.getElementById(id).style.backgroundImage = s;
  }
  
  function changebgback(id)
  {
  	var s = "url(\'menu/" + id + ".gif\')";
	document.getElementById(id).style.backgroundImage = s;
  }