What is causing my div to show up at the bottom rather than to the right?

Attached is a screen shot where you can see some verbiage along the bottom. That verbiage is contained within a div that should be parked to the right of the grey column. Instead, it's running along the bottom and I don't know why.

Here's my stylesheet:

img.bg {
  /* Set rules to fill background */
  min-height: 100%;
  min-width: 1024px;
	
  /* Set up proportionate scaling */
  width: 100%;
  height: auto;
	
  /* Set up positioning */
  position: fixed;
  top: 0;
  left: 0;
}

@media screen and (max-width: 1024px) { /* Specific to this particular image */
  img.bg {
    left: 50%;
    margin-left: -512px;   /* 50% */
  }
}

#header {
position:relative;
margin:auto;
height:359px;
width:1000px;
z-index:3;
}

#body_tray {
position:relative;
width:1000px;
background-color:#000000;
margin:25px auto ;
}

#side_bar {
position:relative;
margin-top:-45px;
margin-left:5px;
width:312px;
height:700px;
}

#main_body {
position:relative;
height:35px;
background-color:#cccccc;
}

#footer {
position:relative;
width:1000px;
margin: 10px auto ;
text-align:center;
font-family: Helvetica, Microsoft Sans Serif;
font-size: 12px;
font-weight:bold;
color: #243987;
}

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..and here's my html:

<IMG SRC="images/background_image.jpg" class="bg">
<div id="body_tray">
	<div id="header"><IMG SRC="images/header.png" usemap="#header" border="0"></div>
	<div id="body_tray">
		<div id="side_bar"><IMG SRC="images/left_column.png"></div>
		<div id="main_body">hello</div>
	</div>
	<div id="footer">The Rotary of Spring Hill & Thompsons Station | Spring Hill, Tennessee<BR><font size="1"><BR></font><A HREF="http://www.brucegust.com" target="_blank"><IMG SRC="images/brucegust_signature.png" border="0"></a><BR><BR></div>
</div>

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It's the grey box with the word "hello" in it. I want that to the right of my "side_bar" div and I'm failing miserably.

Where am I blowing it?
Screen-Shot-2013-05-30-at-5.01.3.png