function scrollDoor() {
        }
        scrollDoor.prototype = {
            sd: function(menus, divs, openClass, closeClass) {
                var _this = this;
                if (menus.length != divs.length) {
                    alert("菜单层数量和内容层数量不一样!");
                    return false;
                }
                for (var i = 0; i < menus.length; i++) {
                    _this.$(menus[i]).value = i;
                    _this.$(menus[i]).onmouseover = function() {
                        for (var j = 0; j < menus.length; j++) {
                            _this.$(menus[j]).className = closeClass;
                            _this.$(divs[j]).style.display = "none";
                        }
                        _this.$(menus[this.value]).className = openClass;
                        _this.$(divs[this.value]).style.display = "block";
                    }
                }
            },
            $: function(oid) {
                if (typeof (oid) == "string")
                    return document.getElementById(oid);
                return oid;
            }
        }
        window.onload = function() {
            var SDmodel = new scrollDoor();
            SDmodel.sd(["m01", "m02", "m03", "m04"], ["c01", "c02", "c03", "c04"], "sd01", "sd02");
        }