.gal_thumb {
    width: 120px;
    height: 80px;
    background-position: center;
    background-repeat: no-repeat;
    float: none;
    margin: 10px 10px 20px 0px;
    cursor: pointer;
}
.image_thumb {
    width: 120px;
}
#mybox {
    margin: auto;
    padding: 10px;
    background-color: #FFF;
    z-index: 100;
    width: 600px;
    position: relative;
    top: 100px;
}


#overlay{
    position: absolute;
    top: 0;
    left: 0;
    z-index: 80;
    width: 100%;
    height: 500px;
    display:none;
    text-align: center;
    background-color: #000;
    filter:alpha(opacity=60);
    -moz-opacity: 0.6;
    opacity: 0.6;
}
.centerbox {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 90;
    width: 100%;
    height: 100%;
    display:none;
    text-align: center;
}