in Dreamweaver Mx 2004 how do you keep a background image from tiling? making it so that it resizes to fit each individual persons moniter size?

You can do that with CSS like this for example:

# div name {
background-image: url(../image/site-bg.jpg);
background-position: center top;
background-repeat: no-repeat;
}

To make it to fit for any user browser size is the other thing, but I suggest you keep the background image wide at least 1200 pixels and keep the main focus of background (if you have any picture or something for the background) to fit for 800x600 pixel browser size.

Hope it helps