How to align header and footer in master page ?

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CSS

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Hai Everyone
How to align header and footer in master page ? my problem is if i click restore down in browser header and footer design is decreased but if i scroll to right the header and footer is not align correctly .i mean it not stretch on full page.

For e.g u click restore down in borwser with this page http://www.codeproject.com/Questions/ask.aspx</a>[^]

u have scroll bar in bottom,if scroll to right and see the bottom banner(orange color )the align not fit on this brower,

pls reply me how to solve this problem.if u not understand pls write commint ,if not possible pls write as commint

Regards
Aravind