#background_sky{
width: 100%;
background: repeat-x bottom url(/images/sky_repeat.gif) #00606d;
}


#background_trees{
width: 100%;
background: repeat-x 614px bottom url(/images/trees_repeat.jpg);


}

#background_tank{
width: 100%;
padding-bottom: 62px;
background: no-repeat left bottom url(/images/tank.jpg);
}

#background_city{
width: 100%;
background: no-repeat 75% 100% url(/images/city.png);
padding-bottom: 140px;

}