.leftPart3Col, .rightPart3Col
{  
  width:75%;
  float:left;
}
.leftPart2Col, .rightPart2Col
{  
  width:50%;
  float:left;
}
.leftPart1Col, .rightPart1Col
{  
  width:25%;
  float:left;
}

/* 3 columns */
.leftPart2of3Col
{  
  width:66%;
  float:left;
}
.rightPart1of3Col
{  
  width:34%;
  float:left;
}
.leftPart1of3Col
{  
  width:34%;
  float:left;
}
.rightPart2of3Col
{  
  width:66%;
  float:left;
}

/* 4 columns */
.leftPart1of4Col
{  
  width:25%;
  float:left;
}
.rightPart3of4Col
{  
  width:75%;
  float:left;
}
.leftPart2of4Col
{  
  width:50%;
  float:left;
}
.rightPart2of4Col
{  
  width:50%;
  float:left;
}
.leftPart3of4Col
{  
  width:75%;
  float:left;
}
.rightPart1of4Col
{  
  width:25%;
  float:left;
}