JQuery 获取父框架的对应ID

JQuery 获取父框架的对应ID
我要从b点击找到index里对应的层，等于是要从父框架动态取得对应的层
$(function(){
    var curMenuId = undefined;
   
    $("li>a").click(function(){
        var menuId = this.id,
            target = $('#' + menuId),
            doc    = window.parent.document;
       
        if (curMenuId) {  
            $("#" + curMenuId).removeClass("on");
            $(doc).contents().find("." + curMenuId).css教程('display', 'none');
        }
       
        target.addClass("on");       
        $(doc).contents().find("." + menuId).css("display","block");
       
        curMenuId = menuId;
    });
});