2009 has a slightly different interface than most of us are used to. To make things simpler have a quick look at the attached pdf - admittedly it is pretty poor quality but you can't have everything can you?
Does your status bar look like this? If so - right click on the button I've marked Modelspace and you should get a little dialog box with the option something like "Show Model / Layout Tabs" - select this option.
Also left click the arrox I've marked "Status Bar Drop Down"; you get a long list of options some with ticks against them and others without - about halfway down is an option something like "Model/Paper" - select this option.
So - when you say you have the A3 border next to the floor plan do you mean both are in the modelspace tab? Or is the floor plan on the modelspace tab and the A3 border on one of the layout tabs?