#header{
margin-right: auto;
margin-left: auto;
height: 50px;
width: 960px;
}

#footer{
margin-right: auto;
margin-left: auto;
width: 90px;
clear: left;
}

#container{
margin-right: auto;
margin-left: auto;
width: 960px;
margin-top: 10px;
text-align: left;
}

#menu{
margin-right: 10px;
float: left;
width: 140px;
}

#body{
float: left;
width:500px;
text-align:justify;
}

#sidebar{
float:right;
width: 300px;
}

body{
text-align:center;
}