Help With Browser Compatibility

Hello,

I designed and built a theme for my website/blog using Dreamweaver. Since the site has been live, I’ve noticed some browser compatibility issues come up and have no idea how to fix them. I’ve changed some of the CSS code around hoping to solve the problem that way, but nothing seems to work. The best site seems to be Firefox; I’ve noticed little to no glitches. Internet explorer, however, is a different story. It seems that whenever I zoom the page above 100%, my right sidebar moves to left forcing the main content div to move down. I don’t know why this is happening and would love some input. My site is http://www.matthewtrust.com. Any help with this would be HUGELY appreciated! Here’s my CSS:

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