The background image is within the box so moving it outside is not feasible like this. What you could do is position your image outside of the box and move it into it.
You can try something like this, it's not foolproof but can get you some of the way there.
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
<style type="text/css">
body {
background-color:#26140C;
}
.box {
width: 800px;
margin: 0 auto;
margin-top: 40px;
padding: 10px;
border: 3px solid #A5927C;
background-color: #3D2216;
}
.image {
float: left;
position: relative;
top: -30px;
}
</style>
</head>
<body>
<div class="box">
<img src='icon_neutral.png' class="image" />
<h1>This is a test!</h1>
</div>
</body>
Ólafur Waage
2009-06-28 00:47:47