div#content-pane {
  width:100%;
}

div#content-pane div#main {
  margin-left: 190px;
  margin-right: 10px;
  width: 580px;
}


div#content-pane div#side1 {
  float:left;
  width:180px;
}

div#content-pane div#side2 {
  float:right;
  width:180px;
}