Your current layout requires a certain minimum window width: ~1100 px in MSIE, ~800 px in Mozilla-based browsers (incl. Firefox).
When the browser window width is smaller than the above width, your DIVs start getting wrapped-around, with each type of browser doing it in a slightly-different manner...
Do you have any idea how I can reduce that minimum width in IE, or make it behave like it does in IE?