.botton {
display:block;
width:250px;
height:50px;
text-indent:-9999px;
}
.botton a {
display:block;
width:100%;
height:100%;
background:url('http://www.insidersinternetmarketing.com/lukrative_marketing_product/images/double_button.png') no-repeat top left;
outline:none
}
.botton a:hover {
background-position:0 -50px;
text-align: center;
}