SOURCE

div{
    border:#f00 2px solid;
    margin:10px;
}
#div1{
    width:90%;
}
#div1-l{
    float:left;
    width:200px;
}
#div1-r{
    float:right;
    width:200px;
}
#div1-c{
    margin:10px 230px;
}