.wraper{ width:1000px; padding-top:10px; margin:0 auto}
.nav{ position:relative; width:100%; height:40px; background:#6699cc; overflow:hidden}
.nav-item{ position:relative; float:left; width:120px; height:40px; line-height:40px; text-align:center; font-size:14px; z-index:1}
.nav-item a{ text-decoration:none;display:block; height:40px; color:#fff; }
.nav-item a:hover{ text-decoration:none;color:#fff}
.move-bg{ display:none;position:absolute;left:0;top:0; width:120px; height:40px; background:#05203d; z-index:0}