jquery.equalize.js

$.fn.equalize = function(options)
{
    var self = this;

    function equalize () {
        var elements = $(self);
        
        // calculate the max height
        var maxHeight = Math.max.apply(null, elements.map(function () {
            return $(this).height();
        }).get());

        elements.each(function (index, dom) {
            var $elem = $(dom);
            $elem.css('height', maxHeight);
        });

    }

    equalize();
    $(window).resize(equalize);
};