Well, an update. I'm pretty much working things out just by tinkering around, as I would have known I would had a been a bit PATIENT.

Let me put my REAL question now: one user, I forget the name but he had the B.Gen "rank," has a newbie tips site, where he says that a width of 780 (I think) will ensure that NO-ONE has to scroll right/left on your page. Is this true? I would like to know a maximum value for width, to ensure that no-one has to do that; I do not care about scrolling up/down.