button {
    background-image:url(../media/barra40.png);
    background-repeat:repeat-x;
    -moz-border-radius:10px 10px 10px 10px;
    height:35px;
    border:1px solid #c1d0f0;
    min-width:120px;
    cursor:pointer;
  }
  button:hover {
    background-image:url(../media/barra40on.png);
    background-repeat:repeat-x;
  }
  button:focus {
    background-image:url(../media/barra40on.png);
    background-repeat:repeat-x;
  }