Container DIV background problem in Firefox

Hi All,

I'm making a site (for a friend) and I'm just starting out using CSS and Divs (usually divs and tables... I know... shoot me!)
I am quite glad of the way it's turned out... when it's in IE.
www.tortoise-world.com/tortsmad
The container div has the background (/images/body.png) and I want this background to repeat depending on the size of the content.

This happens in IE, but without defining a height in pixels for the container div, firefox just doesn't display the background.

Here is the CSS;

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, font, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td {
	margin: 0;
	padding: 0;
	border: 0;
	outline: 0;
	font-weight: inherit;
	font-style: inherit;
	font-size: 100%;
	font-family: inherit;
	vertical-align: baseline;
}
/* remember to define focus styles! */
:focus {
	outline: 0;
}
body {
	line-height: 1.5;
	color: black;
	background: white;
}
/* tables still need 'cellspacing="0"' in the markup */
table {
	border-collapse: separate;
	border-spacing: 0;
}
caption, th, td {
	text-align: left;
	font-weight: normal;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: "";
}
blockquote, q {
	quotes: "" "";
}
a:link
{
	color: rgb(153, 0, 204); 
}
a:visited
{
	color: rgb(153, 0, 204); 
} 
a:active 
{
	color: rgb(153, 0, 204);
}
body
{
	font-family: Century Gothic, Arial, Helvetica;
	color: rgb(0, 51, 102);
}
h6
{
	font-family: Century Gothic, Arial, Helvetica;
}
h5
{
	font-family: Century Gothic, Arial, Helvetica;
}
h4
{
	font-family: Century Gothic, Arial, Helvetica;
}
h3
{
	font-family: Century Gothic, Arial, Helvetica;
}
h2
{
	font-family: Century Gothic, Arial, Helvetica;
}
h1
{
	font-family: Century Gothic, Arial, Helvetica;
}
h1
{
	color: rgb(0, 51, 102);
	font-size: x-large;
}
h2
{
	color: rgb(51, 0, 153); 
}
h3
{
	color: rgb(204, 0, 153); 
}
h4
{
	color: rgb(0, 51, 102);
}
h5
{
	color: rgb(51, 0, 153);
}
h6
{
	color: rgb(204, 0, 153);
}
body {
    background: url(images/background.png) repeat-x #817b74;}
#container {
	background: url(images/body.png) repeat-y;
	width: 1280px;
	margin: 0 auto;

}
#header {
	height: 531px;
	width: 1280px;
	background: url(images/header.png) no-repeat;
}
#footer {
	background: url(images/footer.png) no-repeat;
	clear: both;
}
#content {
    height: 100%;
	width: 600px;
	float: left;
	padding-left: 250px;
}
#navigation {
	width: 200px;
	float: left;
	margin-top: -20px;
	padding-left: 50px;
	margin-right: 0px;
}
#footer {
	float: left;
	width: 1280px;
	padding-top: 30px;
	padding-left: 375px;
}

Code (markup):

Preview the site here;
www.tortoise-world.com/tortsmad

For those of you on a mac, it displays in IE like this;


I want the background to repeat depending on the content. I.E The more content I have... the longer my layout is. I tried having a new background for the content div.. but it was un-equal to the navigation div, so didn't work.
I have tried using height: 100%; in the container div, but that didn't work either.

Hope you guys can help me out
Josh