(function($){

  $.fn.simpleExpander = function(options){
    var target = options.target || undefined;
    var trigger = options.trigger || 'click';
    var collapsedClass = options.collapsedClass || 'collapsed';
    if (typeof(options) == 'string') target = options;
    if (target) {
      $(this).addClass('expander');
      targetToggle(this, target, collapsedClass);
      $(this).bind(trigger, function(){
        $(this).toggleClass(collapsedClass);
        targetToggle(this, target, collapsedClass);
      });
    }
  };

  function targetToggle(el, target, collapsedClass) {
    if ($(el).hasClass(collapsedClass)) { 
      $(target).hide(); 
    } else { 
      $(target).show(); 
    }
  }

})(jQuery);