....
.northnorthwest {
background: transparent url(images/northnorthwest.png);
width: 16px;
height: 8px;
}
.north {
background: transparent url(images/north.png) repeat-x;
height: 8px;
width:300px;
position:relative;
}
.northnortheast {
background: transparent url(images/northnortheast.png);
width: 18px;
height: 8px;
float:right;
position:relative;
}