Ok.. well. There are quite a few things that could be causing it.
You have two closing head tags, and two title tags. You also have two opening body tags. You have a stylesheet in the body section of your page. You also have multiple stylesheets.
I have removed the second body tag, merged the stylesheets, and also used shorthand CSS properties, such as margin: 0; instead of setting each margin separately. =)
You got confused when setting the colors for your underlined and bolded text and such. You had color="#FFFFFF" in a stylesheet. It should have been color: #FFFFFF;. I've fixed those, also.
As for the background image, if it still doesn't show, I think perhaps it is the way it's linked. I remember reading something about Firefox having problems displaying local images. Upload it to either your web host or an image hosting service (like Photobucket), and try it then.
Here's the fixed HTML.
<html>
<!-- Created with the CoffeeCup HTML Editor 2006 -->
<!-- http://www.coffeecup.com/ -->
<!-- Brewed on 10/26/2006 1:09:39 PM -->
<head>
<title>Home</title>
<meta name="generator" content="CoffeeCup Free HTML Editor - www.coffeecup.com">
<meta name="description" content="">
<meta name="keywords" content="">
<style type="text/css">
body {
margin: 0;
padding: auto 0; }
#left {
position: absolute;
left: 50px;
padding: 0px;
top: 0px;
width: 150px; }
#center {
margin-left: 250px;
padding: 0px;
margin-right: 200px;
top: 0px; }
#right {
position: absolute;
right: 15px;
padding: 0px;
top: 0px;
width: 150px; }
a:link {text-decoration: none;}
a:visited {text-decoration: none;}
b {color: #8B5A2B;}
i {color: #556B2F;}
u {color: #EE4000;}
sup {color: #A52A2A;}
sub {color: #008B00;}
s {color: #696969;}
strike {
background: #7CCD7C;
font-family: Comic Sans MS;
font-size: 10px;
font-color: #FFFFFF;
font-weight: bold;
text-decoration: none;
width: 100%; }
</style>
</head>
<body bgcolor="#FF9900" text="#000000" link="#696969" vlink="#800080" alink="#FF0000" background="C:\Documents and Settings\Pixie\My Documents\Website\background.jpg" width="1280" height="800" alt="" border="0" bgproperties="fixed">
<div id="left">
<br><br><br><br><br><br><br><br><br><a href="http://www.geocities.com/shutterxbug/Home.html">Home</a><br><a href="http://www.geocities.com/shutterxbug/Me.html">This Little Girl</a><br><br><b>Photographs</b><br><a href="http://www.geocities.com/shutterxbug/familyphotos.html">Family</a><br><a href="http://www.geocities.com/shutterxbug/petphotos.html">Pets</a><br><br><b>Extra</b><br><a href="http://www.geocities.com/shutterxbug/icons.html">Icons</a><br><a href="http://www.geocities.com/shutterxbug/backgrounds.html">Backgrounds</a><br><a href="http://www.geocities.com/shutterxbug/animations.html">Animations</a><br>
</div>
<div id="center">
<br><br><br><br><br><br><br><br><br><u>October 26, 2006</u><br><br>So, I am going to try to start a new site again. Let's see how long it lasts. I want a place for all my photos though. Hopefully I will have some really good ones soon. Feel free to e-mail me or comment once I get those up. Thanks for stopping by and feel free to look around.<br><br>Also, if you want to use something, please inform me and I will send it to you.<br><br>Thanks again,<br>- <i>Autumn Night</i>
</div>
<div id="right">
<br><br><br><br><br><br><br><br><br><b>Hello</b><br><i>Hello</i><br><u>Hello</u><br><sup>Hello</sup><br><sub>Hello</sub><br><s>Hello</s><br>
</div>
</body>
</html>
Just as a note, you should definitely look into CSS a little more. LEIA tutorials (http://www.lissaexplains.com/css.shtml) are a great place to start, and wouldn't it be nice to get rid of those pesky br tags?
Anyway, hopefully that fixes your problems! =)