@media (min-width: 768px) and (max-width: 991px) {
  #banner {
    background: url(FoxCrossing_Header780x79.png);
    height: 79px;
  }
}

@media (min-width: 992px) and (max-width: 1169px) {
  #banner {
    background: url(FoxCrossing_Header960x98.png);
    height: 98px;
  }
}

@media (min-width: 1170px) {
  #banner {
    background: url(FoxCrossing_Header1170x120.png);
    height: 120px;
  }
}