html, body {
  margin: 0;
}
#leftcol {
  float:left;
  width:100px;
  border:#000 1px solid;
}
#main {
  margin:0px;
}
#centercol {
  border:#f00 1px solid;
  margin:0 210px 0 175px;
}
#rightcol {
  float:right;
  width:200px;
  border:#000 1px solid;
}