谁能帮我解释一下，这段代码的意思啊
<script>
function aa(Dir)
{tt.doScroll(Dir);Timer=setTimeout('aa("'+Dir+'")',100)}//这里100为滚动速度
function StopScroll(){if(Timer!=null)clearTimeout(Timer)}
function initIt(){
divColl=document.all.tags("DIV");
for(i=0; i<divColl.length; i++) {
whichEl=divColl(i);
if(whichEl.className=="child")whichEl.style.display="none";}
}
function expands(el) {
whichEl1=eval(el+"Child");
if (whichEl1.style.display=="none"){
initIt();
whichEl1.style.display="block";
}else{whichEl1.style.display="none";}
}
var tree= 0;
function loadThreadFollow(){
if (tree==0){
document.frames["hiddenframe"].location.replace("LeftTree.asp");
tree=1
}
}
function showsubmenu(sid)
{
whichEl = eval("submenu" + sid);
imgmenu = eval("imgmenu" + sid);
if (whichEl.style.display == "none")
{
eval("submenu" + sid + ".style.display=\"\";");
imgmenu.background="image/menuup.gif";
}
else
{
eval("submenu" + sid + ".style.display=\"none\";");
imgmenu.background="image/menudown.gif";
}
}
function loadingmenu(id){
var loadmenu =eval("menu" + id);
if (loadmenu.innerText=="Loading..."){
document.frames["hiddenframe"].location.replace("LeftTree.asp?menu=menu&id="+id+"");
}
}
top.document.title="公司企业网站管理系统";
</script>
怎么没有人来啊
