hey sam
i also used to have this kind of problem in IE, then i start using a too "IE developer ToolBar ". this toolbar help me out that where my divs and table are in the page .
by using that i foud that there is problem with width of ur div "layoutCenterBody" (in my opinion) .
i think u should download and install this toolbar and look at urself . if u reduce the size of that div so all the div can come under ur div "container".
hope this will help , if it does mark my post as answer
Ahtesham