Javascript显示和隐藏ul列表

Javascript显示和隐藏ul列表

<ul id="rightNav">
  <li>
    <h2 class="rightNavItem"><a href="#">Show & Hide</a></h2>
    <ul>
      <li><a href="">Links etc here</a></li>
    </ul>
  </li>
</ul>
<script>
function enableRightNavExpand() {
  	if (!document.getElementById) return false;
	if (!document.getElementById("rightNav")) return false;
	var nav = document.getElementById("rightNav");
	var navItem = nav.getElementsByTagName("li");
	for (var i = 0; i < navItem.length; i++){
		navItem[i].onclick=function() {
			if (this.className == "selected") {
				this.className = "";
			}
			else if (this.className == ""){
				this.className = "selected";
			}
		}
	}
}
</script>