#right_column, #header_right {
  width:200px;
}

#main_column, #header_main {
  margin: 0px 205px 5px 160px;
}

#left_column, #header_left {
  width:155px;
}

#main_column_1 {
  width: 306px;
  float: left;
}

#main_column_2 {
  width: 306px;
  float: right;
}