JS菜单

<SCRIPT type=text/javascript>
function selectTag(showContent,selfObj){
 // 操作标签
 var tag = document.getElementById("tags").getElementsByTagName("li");
 var taglength = tag.length;
 for(i=0; i<taglength; i++){
  tag[i].className = "butt2";
 }
 selfObj.parentNode.className = "butt1"; 
 // 操作内容
 for(i=0; j=document.getElementById("tagContent"+i); i++){
  j.style.display = "none";
 }
 document.getElementById(showContent).style.display = "block";
 
 
}
</SCRIPT>