backgroung nao acompanha os divs

boas

estou a tentar construir esta layout com tabless, mas tou com um problema, o backgroung nao acompanha os divs, como podem ver na seguinte imagem:

/applications/core/interface/imageproxy/imageproxy.php?img=http://i44.tinypic.com/28u663q.jpg&key=ac3144bcabc65fce57b7eec60ffb41bd90aa79e4d0b9a88f71cb7e3bef76d36b" alt="Imagem Postada" />

alguem sabe kual é o problema?

o código html podem ver aqui!

* {
/ Reset browsers default margin, padding and font sizes /

	margin: 0;
	padding: 0;
}

body {

	background: url(images/bg.jpg) repeat;
}

#banner-bg {

	position:relative;
	z-index:-10;
}

#banner {
	background:url(images/banner_2.jpg) top no-repeat;
	width:1024px;
	height:586px;
	margin:0px auto;
	z-index:-10;
}

#login {
	background:url(images/bg2.jpg) repeat-x;
	height:44px;
	width:100%;
	z-index:-10;
}

#login_caixa {
	width:900px;
	margin: 0px auto;
	font-family:Verdana, Arial, Helvetica, sans-serif;
	font-size:12px;
	font-weight:bold;
	color:#FFFFFF;
	padding: 15px 15px 0px 15px;
}

#main {
	width:930px;
	margin: 0px auto;
	margin-top:-315px;
}

#main_top {
	background:url(images/main_top.png) no-repeat;
	height:20px;
	width:100%;
}

#main_bottom {
	background:url(images/main_bottom.png) no-repeat;
	height:20px;
	clear:left;
	clear: both;
	width:100%;
}

#main_center {
	background-image:url(images/main_bg.png);
	background-position: top;
	background-repeat: repeat-x;
	background-color:#FFFFFF;
	border-left: #797979 solid 3px;
	border-right: #797979 solid 3px;
	width:924px;
	position:static;
	clear:left;

}

#header {
	width:894px;
	margin:15px auto 15px auto;
}

#header_left {
	float:left;
	width:408px;
	max-width:408px;
	height:341px;
}

#header_right {
	float: right;
	width:468px;
	height:341px;
}

#conteudo {
	clear:left;
	padding-top:10px;
}

#forum {
	float:left;
	padding-top:4px;
}

#linkus {
	float:right;
	padding-top:10px;
}

#menu2 {
	position:relative;
	float:left;
}

#noticia {
	background:url(images/bg4.jpg) repeat-y;
	border:#cccccc 2px solid;
	position: static;
	margin-left:204px;
	width:704px;
	margin-bottom:15px;
}

#noticia_borda {
	padding:10px;
}

#navegacao {
	font-weight:bold;
	color:#8e0000;
	margin:0 15px;
	position: static;
	margin-left:204px;
	width:704px;
}

#nav_esq {
	position: static;
	float:left;
}

#nav_dir {
	position: static;
	float:right;
}