.button_off{
  background:url("img/m30_g.gif") no-repeat scroll 0 0 transparent;
  width:190px;
  height: 20px;
  display:block;
}

.button_off:hover{
  background:url("img/m30_b.gif") no-repeat scroll 0 0 transparent;
  width: 190px;
  height: 20px;
  display:block;
}

.button_on{
  background:url("img/m30_r.gif") no-repeat scroll 0 0 transparent;
  width: 190px;
  height: 20px;
  display:block;
}

#button_download {
    color:#000000;
    display:block;
    height:20px;
    left:75px;
    line-height:1.3em;
    padding:10px;
    text-align:center;
    text-decoration:none;
    top:300px;
    width:190px;
    z-index:5;
}

#button_download span {
    display:block;
    font-size:1em;
}

a:hover.button {
    color: #FFF;
}