<!-- First Column -->
<div class="one_half"> Content here... </div>

<!-- Second Column -->
<div class="one_half last"> Content here... </div>

<!-- First Column -->
<div class="one_third"> Content here... </div>

<!-- Second Column -->
<div class="one_third"> Content here... </div>

<!-- Third Column -->
<div class="one_third last"> Content here... </div>

<!-- First Column -->
<div class="one_fourth"> Content here... </div>
                      
                      .
                      .
                      .

<!-- Fourth Column -->
<div class="one_fourth last"> Content here... </div>

<!-- First Column -->
<div class="one_sixth"> Content here... </div>
                      
                      .
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<!-- Sixth Column -->
<div class="one_sixth last"> Content here... </div>