Position a div (AP Div) exactly where you want it in Adobe Dreamweaver

From AskBrianAtwood:

"Have you ever tried to use the AP Divs in Dreamweaver, only to find that they don't stay where you want them? Especially if you have a page with centered content? Where there's a little trick that is super easy once you learn it to get a div to stay in position, even move when another div moves."