body,html {
    margin: 0 auto;
    padding: 0;
    width: 960px;
}
#image {
    width: 100%;
    height: 708px;
    background: url(images/screen1.gif);
    background-position: top center;
    position: relative;
}
#hover_one, #hover_two {
    position: absolute;
    display: block;
}
#hover_one {
    width: 340px;
    height: 330px;
    /*left: 261px;
    top: 284px;*/
}
#hover_one:hover {
    background: url(images/screenmag_small.gif);
}
#hover_two {
    width: 334px;
    height: 308px;
    /*left: 771px;
    top: 294px;*/
}
#hover_two:hover {
    background: url(images/screenshop_small.gif);
}