gistfile1.txt

$.fn.makeEqual = function(){
  var self = this,
      heights = $.map(this, function(el){return $(el).height();}),
      heighestHeight = Math.max.apply(null, heights);

  this.removeHeight = function(){
      $.each(self, function(i, el){
          $(el).css("min-height", "");
      });
  };
  
  return this.css("min-height", heighestHeight + "px");
};