I'm pretty new to CSS and not real sure why my page displays perfectly in Mozilla, but in IE doesn't have my header or my navigation....

www.coreyandjustinwedding.com/indSetup.htm
www.coreyandjustinwedding.com/styles/fixedwidth.css

<html>
</head>
<body>
<div id="wrapper">
<div id="header">
<img src="../images/header.png" alt="wedding bells" width="880" height="215" />
</div>
<div id="content">
<h1>This is the Content</h1>
<p>content...content...content...content...</p>
<p>content...content...content...content...</p>
<p>content...content...content...content...</p>
<p>content...content...content...content...</p>
<p>content...content...content...content...</p>
<p>content...content...content...content...</p>
<p>content...content...content...content...</p>
</div>
<div id="navcontainer">
<ul id="navlist">
<li><a href="" title="mainPage">Main</a></li>
<li><a href="" title="rsvpPage">RSVP</a></li>
<li><a href="" title="bridesmaidPage">For Bridesmaids</a></li>
<li><a href="" title="photoPage">Photo Gallery</a></li>
<li><a href="" title="registryPage">Registry</a></li>
</ul>
</div>
<div id="footer">
This is the FOOTER
</div>
</div>
</body>
</html>

/* CSS Document */

body {
margin: 0;
padding: 0;
font-family: Verdana, Arial, Helvetica, sans-serif;
background-color: #FFFFFF;
text-align: center;
}

#wrapper {
position: relative;
text-align: left;
width: 880px;
margin-right: auto;
margin-left: auto;
padding: 122px 0 0 0;
border-left: 2px solid #6B8DAD;
border-right: 2px solid #6B8DAD;
border-bottom: 2px solid #6B8DAD;
}

#header {
position: absolute;
top: 1px;
left: 1px;
margin: 0;
padding: 0;
background-color: #FFFFFF;
height: 215px;
width: 880px;
background-image: none;
overflow: visible;
visibility: visible;
z-index: auto;
clear: both;
}

#content {
margin-left: 25px;
padding: 100px 225px 0 0;
width: 880px;
float: left;
}

#content p {
font-size: 80%;
line-height: 1.8em;
padding-left: 2em;
}

#content h1 {
font: normal 180% Georgia, "Times New Roman", Times, serif;
color: #6B8DAD;
background-color: transparent;
}

#content h2 {
font-size: 120%;
color: #90A9C1;
background-color: transparent;
border-bottom: 1px solid #6B8DAD;
}

#navcontainer {
position: absolute;
width: 450;
top: 184px;
left: 71px;
float: left;
margin: 10px 0 0 30px;
padding: 0;
height: 20px;
visibility: visible;
z-index: auto;
overflow: visible;


}

#navcontainer ul {
border: 0;
margin: 0;
padding: 0;
list-style-type: none;
text-align: center;
}

#navcontainer ul li {
display: block;
float: left;
text-align: center;
padding: 0;
margin: 0;
}

#navcontainer ul li a {
background: #fff;
width: 85px;
height: 20px;
border-top: 1px solid #698BAB;
border-left: 1px solid #698BAB;
border-bottom: 1px solid #698BAB;
border-right: none;
padding: 0;
margin: 0 0 10px 0;
color: #698BAB;
text-decoration: none;
display: block;
text-align: center;
font: normal 10px/18px "Lucida Grande", "Lucida Sans Unicode", verdana, lucida, sans-serif;
}

#navcontainer ul li a:hover {
color: #C9D5E1;
background: #698BAB;
}

#navcontainer a:active {
background: #C9D5E1;
color: #698BAB;
}

#navcontainer li#active a {
background: #C9D5E1;
border: 1px solid #698BAB;
color: #fff;
}

#footer {
padding: 5px;
font-size: 70%;
color: #FFFFFF;
background-color: #698BAB;
clear: both;
text-align: center;
vertical-align: middle;



}