a.button-download { 
                    float: left;
                    margin-right: 10px;
                    display: block;
                    width: 168px;
                    height: 56px;
                    background: url('/media/images/buttons/action/action_button_209.png');
}

a.button-download span { position: absolute; top: 0; text-indent: -9000px; }

a.button-buynow { 
                  float: left;
                  margin-right: 10px;
                  display: block;
                  width: 168px;
                  height: 56px;
                  background: url('/media/images/buttons/action/action_button_184.png');
}

a.button-buynow span { position: absolute; top: 0; text-indent: -9000px; }