div.header div.logo a {
background: transparent url("../images/logo.png") no-repeat center center;
display: block; height: 138px; text-indent: -9999px; width: 582px; margin-left: 20px; 
}

.menu-mobile .navbar-brand img {
    display: none;
}

.menu-mobile div.navbar-header {
    background: white url('/Style%20Library/images/logo.png') no-repeat 0 center;
}