body {
  padding-top:100px;
}
#top {
  left:0;
  position:fixed;
  top:0;
  width:100%;
}
#nav {
  border-bottom:1px solid #bbb;
  left:0;
  position:fixed;
  top:60px;
  width:100%;
}
#navi ul li ul {
  top:40px;
}
#yah {
  top:41px;
}
.grey_out {
  z-index:90000000;
}