jQuery固定页面顶部导航菜单基于jquery.1.7.2.min.js制作，置顶导航菜单，随滚动条浮动定位菜单，固定菜单到页面顶部。-jQuery fixed page top navigation menu based jquery.1.7.2.min.js production, top navigation menus, scrollbars float position menu, the menu is fixed to the top of the page.