Wie Lücke entfernen?

/* Balken unten (Footer) */
#unten {
    width: 960px;
    color: #000000;
    font-size: 12px;
    padding: 10px;
    margin-top: -10px; <- Hier ändern!
    margin-bottom: 50px;
    background-color: #696969;
    border: 2px solid #c9c9c9; }

#pre_content {display:none;}
#pre_header {display:none;}
#post_header {display:none;}
#post_content {display:none;}
#extraDiv2 {display:none;}
#extraDiv3 {display:none;}
#extraDiv4 {display:none;}
#extraDiv5 {display:none;}
#extraDiv6 {display:none;}
h1#header {display:none;}
#counter {display:none;}
#nav {display:none;}

/* allgemeine Formatierung */
html, body {
font-family: Calibri;
font-size: 13pt;}

html {
background-image:url(http://img.webme.com/pic/p/page-lab/background.jpg);
background-position:center top;}

p {
margin-left:40px;
margin-right:40px;}

a:link, a:visited {
color: #000000;
text-decoration: underline;}

a:hover, a:focus {
color: #000000;
text-decoration: underline;}

td[height="102"]{
position:absolute;
left:50%;
margin-left:-360px;
width: 752px;}   

/* Bereich oben */
#top {
background-image: url(http://img.webme.com/pic/p/page-lab/top1.png);
position:absolute;
left:50%;
margin-left: -480px;
height: 130px;
width:960px; }

/* Navigation */
#navigation {
margin-left: auto;
margin-right: auto;
margin-top:40px;
margin-bottom:10px;
width: 860px;
height:35px;
background-image:url(http://img.webme.com/pic/p/page-lab/leiste1.png);}

#navigation a {
color: #000000;
text-decoration:none;
font-size: 18px;
line-height:1.8em;}

#navigation ul {
margin-left:-21px;}

#navigation li {
list-style-type: none;
float:left;}

#navigation li:after {
content:"|";
margin-left:2px;}

/* Content */
#title span {
position:absolute;
left:50%;
margin-left: -430px;
margin-top:-45px;}

#content {
width:960px;
margin-left: auto;
margin-right: auto;
margin-top:130px;
margin-bottom:0px;
min-height:400px;
background-image: url(http://img.webme.com/pic/p/page-lab/content2.png);}

/* Footer */
#below_content {
background-image: url(http://img.webme.com/pic/p/page-lab/footer2.png);
height:130px;
width:960px;
margin-left:auto;
margin-right:auto;
margin-top:0px;}

<div id="top"><div id="navigation">
<ul>
<li><a href="/Home.htm">Home</a></li>
<li><a href="/Kontakt.htm">Kontakt</a></li>
<li><a href="/IDs.htm">IDs und Klassen</a></li>
</ul>
</div></div>

<hr width="80%" style="margin-top:0px;">
<div style="margin-left:40px; margin-right:40px;">(c) 2010 Copyright by page-lab</div>