$.fn.equalHeights = function(px) {
    $(this).each(function() {
        var currentTallest = 0;
        $(this).children().each(function(i) {
            if ($(this).height() > currentTallest) { currentTallest = $(this).height(); }
        });
        //if (!px || !Number.prototype.pxToEm) currentTallest = currentTallest.pxToEm(); //use ems unless px is specified
        $(this).children().css({ 'min-height': currentTallest });
        // for ie6, set height since min-height isn't supported
        if ($.browser.msie && $.browser.version < 7.0) { $(this).children().css({ 'height': currentTallest }); }
    });
    return this;
};