超酷页面左侧导航菜单

#base { OVERFLOW: hidden; WIDTH: 215px; POSITION: relative; HEIGHT: 40px } #cover { VISIBILITY: hidden; OVERFLOW: hidden; WIDTH: 215px; POSITION: absolute; HEIGHT: 40px } #cuscroll { LEFT: 0px; VISIBILITY: inherit; WIDTH: 202px; POSITION: absolute; TOP: 0px; HEIGHT: 40px } .border { BORDER-RIGHT