html,body {
    margin:0px;
    padding: 0px;
}
body {
    background:#fff;
    height: 100%;
    _overflow: hidden;
}
div#waku {
    overflow: auto;
    height: 100%;
}
p#cent {
    position:fixed;
    left: 50%;
    top: 50%;
    border: 1px solid blue;
    _position: absolute;
    width: 160px;
    height: 120px;
    margin-left: -80px;
    margin-top: -60px;
}