website alignment in IE different from firefox

I am using JM Lead and I am having issues with the alignment of the website.
In firefox it is centered as I prefer, but when I use IE8 the site is left-aligned.
Can anyone help me on what css code I would need to alter/add to fix this issue.
I really want the site to be centered.
There is also a problem in the slideshow (using IE8) I have circled this on the screenshot.
The little dot images dont show up correctly…
I will attach screenshots, but I cannot post url here since the site is offline , but can give a login to someone that may be able to help.
Thanks a million to anyone with hints!

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