$.fn.equalHeights = function(px) {
    $(this).each(function(){
        var currentTallest = 0;
        $(this).children().each(function(i){
            if ($(this).height() > currentTallest) { currentTallest = $(this).height(); }
        });
        // for ie6, set height since min-height isn't supported
        if ($.browser.msie && $.browser.version == 6.0) { $(this).children().css({'height': currentTallest}); $(this).css({'height': currentTallest}); }
        $(this).children().css({'min-height': currentTallest});
        $(this).css({'min-height': currentTallest});
    });
    return this;
};
$(function(){ $('#middle').equalHeights();});