Getting my content centered with CSS

I am having trouble with centering my webpage. I usually just use margin: 0 auto; and it has always worked but I am running into a problem on this one.

here is a live example: http://dev.anathallo.net/trin/index.html

and here is the code I am using:

HTML:
<!doctype html>
<html>
<head>
<title>Con-Sol Enterprises</title>
<link href="css/global.css" rel="stylesheet" type="text/css">
<!-- include jQuery library -->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js"></script>

<!-- include Cycle plugin -->
<script type="text/javascript" src="http://cloud.github.com/downloads/malsup/cycle/jquery.cycle.all.2.74.js"></script>

<!--  initialize the slideshow when the DOM is ready -->
<script type="text/javascript">
$(document).ready(function() {
    $('.slideshow').cycle({
    fx: 'fade',
    timeout: 10000,
  });
});
</script>
</head>
<body>

 <div class="slideshow">
    <img src="img_1.jpg" />
    <img src="img_2.jpg" />
    <img src="img_3.jpg" />
    <img src="img_4.jpg" />
  </div>
        <div id="container">
     
          <div class="header">
            
            <div class="logo">
              <img src="img/con_sol.png" />
            <!-- end of .logo -->
            </div>
          
        <div class="contactNumber">
          <p>Phone: (805) 648-3486 | Fax: (805) 648-3735</p>
        </div>
          
        <div class="navbar">
          <table align="center">
            <td><a href="index.html">Home</a></td>
            <td><a href="services.html">Services</a></td>
            <td><a href="about.html">About</a></td>
            <td><a href="contact.html">Contact</a></td>

          </table>
        </div>
      
          <!--end of header -->
          </div>
          
            <div class="content">
              <h1>H1 - Header</h1>
            <!--end of content--> 
            </div>
            
          <div class="footer">

            
          <!--end of footer -->
          </div>
          
      <!---end of container-->
      </div>
  
</body> 
</html>

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CSS:
a:link, a:visited {   /*special rules for links in the navbar*/
  padding: 5px 10px 3px 10px;
  margin: 0px 10px 0px 10px; 
  text-decoration: none;
  color: #fff;
}
a:hover{
  padding: 5px 10px 3px 10px;
  margin: 0px 10px 0px 10px;
  background-color: #fff; 
  text-decoration: none;
  color: #000;
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  border-radius: 5px;
}
/*CSS for jquery background slideshow*/
.slideshow { 
  position:absolute; 
  z-index:0; 
  margin: 0 auto; 
  color: #000;
}
.slideshow img {
  background-color: #000; 
  position:absolute; 
  z-index:0; 
  color: #000;}
/*end of slideshow CSS*/
body {
 color: #000;
 margin: 0px;
 font-family: "Myriad Pro", Arial, Helvetica, Tahoma, sans-serif; 
 background-color: #000;
}

#container {
  margin: 0 auto;
  width: 1000px;
  position:absolute;
  z-index:15;  
}

.header {
  height: 1%;
  overflow: hidden;
  z-index:2;
}

.logo {
  padding: 25px;
  float: left;
  height: 103px;
  width: 400px;
  z-index:1;
}

.navbar {
  /*background-image:url(../img/bg_black_transparent.png);*/
  background-color: #000;
  float: right;
  width: 375px;
  margin: 0px;
  padding: 10px;
  -webkit-border-bottom-right-radius: 5px;
  -webkit-border-bottom-left-radius: 5px;
  -moz-border-radius-bottomright: 5px;
  -moz-border-radius-bottomleft: 5px;
  border-bottom-right-radius: 5px;
  border-bottom-left-radius: 5px;
}
.contactNumber {
  /*background-image:url(../img/bg_black_transparent.png);*/
  background-color: #000;
  color: #999;
  padding: 0px 10px 0px 10px;
  float: right;
  width: 335px;
  padding-left: 50px;
  border-bottom: thin solid #333;
}
.contactNumber p {
  margin:5px 0px 5px 0px;
}
.content {
  color: #fff;
  background-image:url(../img/bg_black_transparent.png);
  margin-top: 100px;
  padding: 10px 10px 10px 10px;
  height: 700px;
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  border-radius: 5px; 
}
.content h1 {
  border-bottom: solid thin #333;
}

.footer {

}

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Thank you in advance!
RNBAsked:
Who is Participating?
 
Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
Try "position:relative;". 'z-index' needs the position statement to work.
#container {
  margin: 0 auto;
  width: 1000px;
  position:relative;
  z-index:15;  
}

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0
 
Dave BaldwinFixer of ProblemsCommented:
Drop the position:absolute;.  Since you didn't put in the top/left positions, it assumes 0/0 and kills the "margin: 0 auto;"
#container {
  margin: 0 auto;
  width: 1000px;
  z-index:15;  
}

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0
 
Lukasz ChmielewskiCommented:
You would have to add text-align: center to a wrapping div which has to be cetered, in this case body:
body{
   text-align: center;
}
0
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RNBAuthor Commented:
Thank you both for your responses so far.

@DaveBaldwin, if i drop the position: absolute; then my container div no longer goes on top of my slideshow div which I am using for the background. the container div goes behind the slideshow.

@Roads Roads, that simple did not move the divs to be centered, it only centered the text.
0
 
Lukasz ChmielewskiCommented:
I meant to add this to Dave's margin: 0 auto. Centering only with margin 0 auto requires the wrapping container to have that value set to center.
0
 
Lukasz ChmielewskiCommented:
How about wrapping the slideshow into the container having margin: 0 auto and width: 1200px; ?
0
 
Dave BaldwinFixer of ProblemsCommented:
Then you need to give a 'top' and 'left' position for 'container'.  When you put 'position:absolute;', 'margin: auto;' will not do anything.
0
 
RNBAuthor Commented:
Awesome Dave, that centered the container perfectly. Now I just need to center the slideshow div, is there a way for that?
0
 
Dave BaldwinFixer of ProblemsCommented:
I would wrap the slideshow div in a <center> tag in case the slideshow javascript rewrites the style info in the <div>.
0
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