.button_syujet a {
font: bold 12px Verdana, Arial, sans-serif;
text-decoration: none;
text-indent: 4px;
color: #FFFFFF; 
background: url(/files/shkola_hvaly/detaly/skachat_rolik/sujet_duble.jpg);
display: block;
width: 291px;
line-height: 40px;
height: 40px;
}

.button_syujet a:hover{
background-position: 0px -40px;
text-decoration: none;
color: #FFFFFF;
}