Weird Layout Problem

I have created my own custom theme for the site educationthemes.co.uk. On Firefox the site works a treat and it is the same with Safari and Opera, however in Internet Explorer there are some stange things happening which I just cannot figure.

As you can see on the homepage the container sits to the left which is shouldn’t. It should sit in the centre like all the others however they are using the same div and CSS rule (container).

Also on the home page my body tag displays correctly as I have given it margin and padding zero, however on the other pages it doesn’t display a zero margin at the top.

I have been searching for this for days now and bar recoding the entire theme I am at a loss as to what to do. I have tried everything, but if anyone can help then it would be much appreciated.

educationthemes.co.uk