.button
{
width: 40px;
height: 30px;
border: none;
padding: 0px;
margin: 0px;
font-family: verdana;
font-size: 12px;
font-weight: normal;
text-align: center;
text-decoration: none;
background: url(/Posters/button_01.JPG) no-repeat 0px 0px;
} 

.button:hover {
background: url(/Posters/button_01.JPG) no-repeat 0px -30px;
} 

.button1
{
width: 30px;
height: 30px;
border: none;
padding: 0px;
margin: 0px;
font-family: verdana;
font-size: 12px;
font-weight: normal;
text-align: center;
text-decoration: none;
background: url(/Posters/button_AB.JPG) no-repeat 0px 0px;
} 

.button1:hover {
font-weight: bold;
background: url(/Posters/button_AB.JPG) no-repeat 0px -30px;
}