#main{
  background: white url(../img/backgrounds/login-main.gif?1) 0 0 no-repeat;
}

body.reading-site #main{
  background: white url(../img/backgrounds/reading_header.gif) no-repeat;
}

body.reading-owl #main{
  background: white url(../img/backgrounds/reading_header.gif) no-repeat;
}

body.maths-site #main{
  background: white url(../img/backgrounds/maths_header.gif) no-repeat;
}

body.maths-owl #main{
  background: white url(../img/backgrounds/maths_header.gif) no-repeat;
}