Not loading in IE

I am having a few issues with my site not loading in IE, here.

It looks fine in FF, however in IE the sidebar has moved to the right and is too thin. There should be a background image in sidebar h2, which doesn’t render.

Also the sliding door menu looks completely wrong.

I have read about the if condition for creating a second style sheet, I have created this sheet however the browser is still not detecting the second stylesheet.

I would be grateful for any help.