Three fluid columns with negative margin centering

Left Column

This is the left column, which is floated left within the container div; since it is the first in the list, it displays to the far left.

Center, or Content Column

This is the second, or center column, which is floated left within the container div; since it is second in the list, it displays next to (to the right of) the first column. The container div that encloses all three of these columns plus the header and footer has been assigned an absolute position, left at 50 per cent. The width is assigned a percentage instead of fixed pixels. The left margin of the entire container is negative of half the width of the container, thus making it display in the center of the page.

Right Column

This is the third column, which also is floated left within the container div and displays next to (to the right of) the second column.