Browser Compatibility

Iv been thinking about browser compatibility issues with regards to my new portfolio site. As iv been building it, iv been previewing the site in Google chrome.

I checked it in opera the other day and the menu had shifted so it slightly overlapped the main content window. I was slightly annoyed by this. But not as annoyed as when i previewed it in I.E!

Iv been thinking about this and have decided to get rid of the floating menu and incorporate the navigation in to the main window. This will eradicate the issue and gives me a nice idea for some 'tabbed' pages.