#container{
  background-color:#0ff;
  float:left;
  width:500px;
  border-left:150px solid #0f0; » 
  /* The width and color of the left rail */
  border-right:200px solid #f00; » 
  /* The width and color of the right rail */
}
#leftRail{
  float:left;
  width:150px;
  margin-left:-150px;
  position:relative;
}
#center{
  float:left;
  width:500px;
  margin-right:-500px;
}
#rightRail{
  float:right;
  width:200px;
  margin-right:-200px;
  position:relative;
}

css - three col

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