blocks-equalize.js

$(function(){
  $('.block-grid').each(function(index){
    var $this = $(this),
        blocks = $.makeArray($this.find('.block')).sort(sortByHeight)[0];
    $this.find('.block').height($(blocks).height());
  });
});
function sortByHeight(a,b) {
  return ($(b).height() - $(a).height());
}