.button a{
font: bold 9px Tahoma, Verdana, Arial, sans-serif;
text-decoration: none;
text-indent: 10px;
color: #FFFFFF;
background: url("images/mybutton.png");
display: block;
width: 257px;
line-height: 24px;
height: 24px;
}

.button a:hover{
background-position: 0px -24px;
text-decoration: none;
color: #000000;
}