a jQuery plugin base to create new jQuery plugins

jquery_plugin_base.js

// app.js
$(document).ready(function(){
    $('#calendar').calendarize({
      param2: 'custom param2'  
    });
});

//calendarize.js
(function($){

  $.fn.calendarize = function(opt){

   /* if there are no elements then just return */
   if (!this.length) return this;

    var defaults = {
      param1: 'param1',
      param2: 'param2'
    };

    var options = $.extend(defaults,opt);

    alert('param1 has value ' + options.param1);
    alert('param2 has value ' + options.param2);

    return this.each(function(){
      // real business logic will go in here
      // options is directly accessible. No need to pass it around
      var $this = $(this);

      function test1(){
        alert('this is test1');
        alert(options.param1);
      }

      function test2(){
        alert('this is test2');
      }

      test1();
      test2();

    }); // end of return this.each(function())
  }; // end of plugin
})(jQuery);