Question

Please take a look at this link. Hover cursor on any movie thumbnail. Have you noticed that, all li elements moving down? How can I fix that problem?

Also, click on any thumbnail, player div will slide down. there is no box shadow under #player_container even if I set it in css files

#player_container{
    display:none;
    height:510px;    
    width: 100%;
    background-image: url(images/bg/bg_tile.jpg);
    margin-top: -510px;
    padding-top: 20px;
        -moz-box-shadow: 0px 10px 5px #888;
    -webkit-box-shadow: 0px 10px 5px #888;
    box-shadow: 0px 10px 5px #888;
}

Answer 1

On video add a transparent border seems to fix it

.video {
    border: 1px solid transparent;
    float: left;
    font-size: 11px;
    height: 150px;
    margin: 0 25px 25px 0;
    width: 228px;
}

There is a couple off different way to fix the next part off your question. One quick way is too add another container like

<div style="display: block;" class="gradient sh" id="player_container">

    <div class="jquery-youtube-tubeplayer" id="player">

    <div id="tubeplayer-player-container1324082555277"><iframe width="853" height="480" frameborder="0" src="http://www.youtube.com/embed/LxBGDijiii0?autoplay=1&amp;autohide=1&amp;controls=1&amp;rel=0&amp;fs=1&amp;wmode=transparent&amp;showinfo=0&amp;modestbranding=0&amp;start=0&amp;theme=dark&amp;color=red&amp;enablejsapi=1&amp;origin=http://tural.us" title="YouTube video player" allowfullscreen=""></iframe></div></div>.
    <div class="bottomSpan"></div>    
</div>

and put your box shadow on this

.bottomSpan {
    box-shadow: 0 10px 5px #888888;
    display: block;
    height: 17px;
    position: absolute;
    width: 100%;
}