.button a {
font: bold 12px Verdana, Arial, sans-serif;
text-decoration: none;
text-indent: 4px;
color: #603913; 
background: url(mybutton.png);
display: block;
width: 140px;
line-height: 24px;
height: 24px;
}

.button a:hover{
background-position: 0px -24px;
text-decoration: none;
color: #ffffcc