div#header {
width: 990px;
height: 125px;
position: relative;
left: 50%;
margin-left: -495px;
border: 0px solid yellow;
}

div#nav {
width: 967px;
padding-left: 23px;
height: 35px;
border: 0px solid green;
position: absolute;
left: 0;
bottom: 0;
}

div#content {
position: relative;
float: left;
width: 630px;
left: 50%;
margin-left: -473px;
margin-top: 20px;
margin-bottom: 40px;
border: 0px solid green;
}

div#sidebar {
position: relative;
float: left;
width: 300px;
height: 900px;
left: 50%;
margin-left: 16px;
margin-top: 20px;
margin-bottom: 40px;
border: 0px solid red;
}

div#footer {
position: relative;
clear: both;
width: 970px;
padding: 10px;
height: auto;
left: 50%;
margin-left: -495px;
border: 0px solid green;
}