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/* The same height of the columns */
function setEqualHeight(columns){
    var tallestcolumn = 0;
    columns.each(
        function(){
            currentHeight = $(this).height();
            if(currentHeight > tallestcolumn){
                tallestcolumn = currentHeight;
            }
        }
    );
    columns.height(tallestcolumn);
}
$(document).ready(function() {
    setEqualHeight($(".wrapper > .item-wrap"));
});

<div class=”wrapper”>
  <div class=”item-wrap”> … Lots Of Content … </div>
  <div class=”item-wrap”> …. Lots Of Content … </div>
  <div class=”item-wrap”> … Lots Of Content … </div>
</div>

.wrapper {
  width: 900px;
  margin-left: auto;
  margin-right: auto;
}
.item-wrap {
  float: left;
  width: 33%;
}