<style>
#container{
width:100%;
height:100%;
background-image:url(http://thumbs.dreamstime.com/thumblarge_536/12838649102C1cO5.jpg);
}
</style>
<div id="container"><br><br>
<a href="" id="linktomouseover">hover</a>
</div>
<script>
jQuery('#linktomouseover').hover(function()
{
jQuery('#container').css("background-image", "url(http://static4.depositphotos.com/1011237/285/i/450/dep_2853473-Background-for-your-web-store.jpg)");
});
</script>