If you want it, you are on a wrong path in principle. If you use CSS and right styles, your page stretched to the size of the window client width maintaining reasonable good-looking and well-readable proportions between columns and other elements by itself. You need to use style properties like
width:100%
and similar things. Learn CSS, box model and layout properties. You just need to learn appropriate styles, peculiarities of the elements you want to use and practice, possibly with different Web browsers. Consult
http://www.w3.org/Style/CSS/[
^].
A personal advice from me, based on my taste: keep it more simple. The user wants clear readability and informative content, not decorations.
—SA