Why does my container div move?

A website I am designing has a container div in order to make the website viewable in smaller screen resolutions. I have centred it using css (margin:0 auto and position:relative) and in the majority of my pages I have a two column layout, but in the pages where I have altered the layout to one column the entire... show more A website I am designing has a container div in order to make the website viewable in smaller screen resolutions. I have centred it using css (margin:0 auto and position:relative) and in the majority of my pages I have a two column layout, but in the pages where I have altered the layout to one column the entire container div moves to the right. The contents still appears centred in the container div. I have searched and searched as to what I am doing to cause this, so anyone who can help gets a pint!
Update: Thanks - that is an excellent website!
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