ALL of your problems are due to wrong typing. the about us page, i.e., is in http://www.americansteelsupply.com/about us.html .
Your metal buildings is in http://www.americansteelsupply.com/metal buildings.html instead of http://www.americansteelsupply.com/building.html that you have typed.

Check your typing. What you type in your menu or nav bar UR field MUST be excactly the same as your pages names.

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