.nav{ position:fixed; right:-2px; top:35px; width:145px; z-index:1; z-index:999;}
.nav a{ overflow:hidden; position:relative; display:inline-block; width:145px; height:95px; margin-top:-15px; background:url('../img/nav/nav.png') no-repeat 0 0; border:none; }
.nav a .out{ position:absolute; top:0; left:0; transition:all 200ms linear;}
.nav a .over{ position:absolute; top:-30px; left:145px; transition:all 200ms linear;}
.nav a:hover .over,.nav a.cur .over{ top:0; left:0;}
.nav a:hover .out,.nav a.cur .out{ top:-30px; left:145px;}