#content{
  background-color:#fff;
  width:600px;
  border-right:150px solid #f00; 
  /* The width and color of the rail */
  margin-right:-150px; /* Hat tip to Ryan Brill */
  float:left;
}
#rail{
  background-color:#0ff;
  width:120px;
  float:left;
}
#container{
  background-color:#fff;
  float:left;
  width:500px;
  border-left:180px solid #0ff;  
  /* The width and color of the left rail */
  border-right:200px solid #fff; 
  /* The width and color of the right rail */
}
#leftRail{
  float:left;
  width:180px;
  margin-left:-180px;
  position:relative;
}
#center{
  float:left;
  width:500px;
  margin-right:-500px;
}
#rightRail{
  float:right;
  width:200px;
  margin-right:-200px;
  position:relative;
}