#image_01 {
  background: transparent url(../pix/button_residence.jpg) no-repeat;
}

#image_02 {
  background: transparent url(../pix/button_studio.jpg) no-repeat;
}

#image_03 {
  background: transparent url(../pix/button_corner_studio.jpg) no-repeat;
}

#image_04 {
  background: transparent url(../pix/button_penthouse.jpg) no-repeat;
}