<style type="text/css">

body {
 background-color: #ffffff;

}


#image {
 position: absolute;
 margin: auto;
 top: 0;
 left: 0;
 right: 0;
 bottom: 0;
width: 900px;
height: 800px;

 background-image:url("Image #1 Here");
background-size:100% 100%;

}

#image:hover {
 background-image:url("Rollover Image Here");
background-size:100% 100%;
}
</style>

<div id="image">
</div>