button.rounded_green {
background: transparent url( btn_right_green.png ) no-repeat scroll right top;
clear: left;
font-size: 0.8em;
}

button.rounded_green span {
background: transparent url( btn_left_green.png ) no-repeat scroll left top;
color: #FFFFFF;
}

button.rounded_green:hover {
background-position: 100% -23px;
}

button.rounded_green:hover span {
background-position: 0% -23px;
}