.WY_iframe {
    border: none;
    margin: -15px;
    display: block;
    width: 600px;
    height: 450px;
}
.WY_link {
    position: relative;
    display: inline-block;
    background: url('play-h.png') center center no-repeat;
}
.WY_link:after {
    content: " ";
    position: absolute;
    display: block;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('play.png') center center no-repeat;
}
.WY_link:hover:after {
    background-image: url('play-h.png');
}