#topleft,#topright,#bottomleft,#bottomright {
position:absolute;
}

#topleft {
left: 20px;
top: 20px;
width: 348px;
height: 300px;
}

#topright {
background-image:url(images/truck.png);
left: 388px;
top: 20px;
width: 348px;
height: 300px;
}

#bottomleft {
left: 20px;
top: 340px;
width: 348px;
height: 300px;
}

#bottomright {
left: 388px;
top: 340px;
width: 348px;
height: 300px;
}