A simple jQuery plugin example.

jquery.explainify.js

/**
 * @author Scott Lewis
 * @date June 4, 2011
 * @link http://technify.me
 *
 * Just follow the comments in the code to understand what's going on.
 */
/**
 * Create an anonymous function to avoid library conflicts
 */
(function($) {
    /**
     * Add our plugin to the jQuery.fn object
     */
    $.fn.explainify = function(options) {
        /**
         * Define some default settings
         */
        var defaults = {
            "color": "#F00",
            "font-weight": "bold"
        };
        /**
         * Merge the runtime options with the default settings
         */
        var options = $.extend({}, defaults, options);
        /**
         * Iterate through the collection of elements and
         * return the object to preserve method chaining
         */
        return this.each(function(i) {
            /**
             * Wrap the current element in an instance of jQuery
             */
            var $this = $(this);
            /**
             * Do our kick-ass thing
             */
            $this.css("color", options.color);
        });
    };
})(jQuery);

/**
 * Calling the plugin
 */
$(function() {
    $("h2").explainify({
        "color": "blue",
        "font-weight": "bold"
    });
});