请问如下JS代码如何用JQUERY改写，谢谢

Question

function switchLeftMenu(tabpage, itemId) {
var oItem = document.getElementById(tabpage).getElementsByTagName("li");
for ( var i = 0; i < oItem.length; i++) {
var x = oItem[i];
x.className = "";
}
document.getElementById(itemId).className = "Selected";
var dvs = document.getElementById("leftMenuTitle").getElementsByTagName(
"ul");
for ( var i = 0; i < dvs.length; i++) {
if (dvs[i].id == ("t" + itemId))
dvs[i].style.display = 'block';
else
dvs[i].style.display = 'none';
}
}

Answer 1

大概是这样：
function switchLeftMenu(tabpage, itemId) {

$("#"+tabpage).find("li").each(function(){
$(this).attr("className","");
});
$("#"+itemId).attr("className","Selected");
$("#leftMenuTitle").find("ul").each(function(){
if($(this).attr("id")=="t"+itemId){
$(this).attr("style","display:block");
}else{
$(this).attr("style","display:none");
}

});

}