js判断当前页是否与链接一致而现实不同css

<script type="text/javascript">
        function MemberFunctionMenu(id) {
            var menus = [];

            this.css = "";
            this.activeItemCss = "";

            this.addMenu = function(text, url, target) {
                var o = new Object();
                o.text = text;
                o.url = url;
                o.target = target;
                menus[menus.length] = o;
            }

            this.render = function() {
                var container = document.getElementById(id);
                if (!container) {
                    document.write("<div id='" + id + "'></div>");
                    container = document.getElementById(id);
                }

                if (this.css && this.css != "") {
                    var oCss = container.getAttribute("class");
                    var css = (oCss && oCss != "") ? oCss + " " + this.css : this.css;
                    container.setAttribute("className", css);
                    container.setAttribute("class", css);
                }

                var ul = document.createElement("UL");
                container.appendChild(ul);

                for (var i = 0; i < menus.length; i++) {
                    var li = document.createElement("LI");

                    if (window.location.pathname.toString().toLowerCase() == menus[i].url.toLowerCase()) {
                        if (this.activeItemCss && this.activeItemCss != "") {
                            li.setAttribute("className", this.activeItemCss);
                            li.setAttribute("class", this.activeItemCss);
                        }
                        var span = document.createElement("SPAN");
                        span.innerHTML = menus[i].text;
                        li.appendChild(span);
                    }
                    else {
                        var a = document.createElement("A");
                        a.href = menus[i].url;
                        a.innerHTML = menus[i].text;
                        if (menus[i].target && menus[i].target != "")
                            a.target = menus[i].target;
                        li.appendChild(a);
                    }
                    ul.appendChild(li);
                }

            }
        }
        var menu10 = new MemberFunctionMenu("menu10");
        menu10.css = "memberLeftMenu";
        menu10.activeItemCss = "activeItem";
        menu10.addMenu("网站基本设置", "/user/website.aspx");
        menu10.render();
    </script>