div.targetImage1{
    position:relative;
    width:288px;
    height:216px;
}
div.targetImage2{
    position:relative;
    width:600px;
    height:137px;
}
span.guard{
    position:absolute;
    display:block;
    width:100%;
    height:100%;
    background-image:url(./img/spacer.gif);
}