[css layout][15]Liquid, secondary columns fixed-width

#wrapper {
float: left;
margin-right: 400px;
}
#navigation {
width: 200px;
float: left;
margin-left: -400px;
}
#extra {
width: 200px;
float: left;
margin-left: -200px;
}
#footer {
clear: both;
}

#wrapper {
float: right;
margin-right: 400px;
}
#navigation {
width: 200px;
float: right;
margin-right: -100%;
position: relative;
left: -200px;
}
#extra {
width: 200px;
float: right;
margin-right: -100%;
}
#footer {
clear: both;
}