backround and #logowrapper

If you open up your template's CSS file, you will notice a Body area. Mine looks like:

body {
	margin: 0;
	font-family: verdana, arial, helvetica, sans-serif;
	font-size: 62.5%;
	color: #000000;
	background-color: #000099;
	}

If I change the "backround-color", that changes the color of the side trim on my page. How can I make that side trim go away and allow my #logowrapper to cover the entire page?

Well, as that's the whole background, you CAN'T make it go away, as that's what your sites pages actually "lay" on, but you CAN change that background to #fff; (white).
Then you can make your site use the whole page by finding this line of code:

#mainWrapper {
    background-color: #ffffff;
    text-align: left;
    width: 750px;
    vertical-align: top;
    border: 1px solid #9a9a9a;
    }

And change the "width: 750px;" to width: 100%;

Get Em Fast:

Well, as that's the whole background, you CAN'T make it go away, as that's what your sites pages actually "lay" on, but you CAN change that background to #fff; (white).
Then you can make your site use the whole page by finding this line of code:

#mainWrapper {
background-color: #ffffff;
text-align: left;
width: 750px;
vertical-align: top;
border: 1px solid #9a9a9a;
}

> 
> And change the "width: 750px;"  to  width: 100%;

How would you go or is it even possible to have a full pic as a background and the site that goes on top in width 1024 for example but your screen is 1600 x  so you could see the 'behind' (excuse my french) hence the pic.
Is this even possbile ?

As you said, you can't have a body background image that will work with all screen resolutions, unless it's a simple repeating image that you can 'tile'.