If you're looking for a blog layout of some sort (three columns, and such) you should consider setting the widths by percentage, thus making the sizes relative to the column container (the outer div).
As for the column alignment, you could float all the columns left. That way, the left one goes first, the middle one in the middle, and the last one to the right.
Nichito
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The two divs classes will be same Floatleft and Float right as in the code. The second Div will give the margin left according to page width.
Rauny
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