Here is what I did and this modification seems to work:
#container {
float: left;
margin: 0 -330px 0 0;
width: 100%;
}
#content {
margin: 0 370px 0 20px;
}
#primary,
#secondary {
float: right;
overflow: hidden;
width: 310px;
}
#secondary {
clear: right;
}
