SO jQuery Fiddle

Test Fiddle mainly for SO Questions jQuery 1.4.3, UI 1.8.5

by Kevin Vess

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/themes/ui-lightness/jquery-ui.css">
<div>Test</div>
<div>Test <br />Test</div>
<div>Test</div>
<div>Test <br />Test</div>
<div>Test</div>
<div>Test <br />Test</div>
<div>Test</div>
<div>Test <br />Test</div>
<div>Test</div>
<div>Test <br />Test</div>
<button>Equalize</button>

CSS

div { display: inline-block; border: solid 1px #ddd; vertical-align: top; }

JavaScript

$.fn.setMinHeight = function(setCount) {
  for(var i = 0; i < this.length; i+=setCount) {
    var curSet = this.slice(i, i+setCount), 
        height = 0;
    curSet.each(function() { height = Math.max(height, $(this).height()); })
          .css('min-height', height);
    console.log(height);
  }
  return this;
};
$("button").click(function() {
    $("div").setMinHeight(2);
});