Simple jQuery base plugin

jquery-plugin-demo.html.js

$(document).ready(function() {
   // put all your jQuery goodness in here.
   $('#sandbox').pluginName({
       fontSize : '2em',
       onComplete : function() {
           $( this ).fadeOut( 5000 );
       },
       onSetup : function() {
           $( this ).css( 'color', 'blue' );
       }
   });
});

jquery-plugin-demo.js

;(function( window, document, $, undefined ) {
    'use strict';

    $.fn.pluginName = function( options ) {

        options = $.extend( $.fn.pluginName.defaults, options );

        // Plugin code
        return this.each( function() {

            var element = $( this );

            element.animate({
                    marginLeft : options.fromLeft,
                    fontSize : options.fontSize
                }, {
                    complete : options.onComplete // call "onComplete" animate callback
                }
            );

            // call "onSetup" callback and apply the scope:
            if ( $.isFunction( options.onSetup ) ) {
                options.onSetup.call( element );
            }

        });

    };

    // Set up the default options.
    $.fn.pluginName.defaults = {
        fromLeft : '+=50',
        fontSize : '20px',
        onComplete : null,
        onSetup : null
    };

})( window, document, jQuery );