a.sp01{
background-image:url(img/sp01.png);
display:block;
width:400px;
height:300px;
text-indent:-9999px;
}

a.sp01:hover{
background-position:left bottom;
}

a.sp02{
background-image:url(img/sp02.png);
display:block;
width:400px;
height:300px;
text-indent:-9999px;
}

a.sp02:hover{
background-position:left bottom;
}