Simple jQuery plugin used to display contextual help

jquery.helpbox.js

/**
 * jQuery helpBox plugin v0.1
 * ==========================
 *
 * http://www.dhar.fr
 *
 * Provides a simple way to add contextual help in your page.
 * @author Olivier Audard - audard[AT]gmail[DOT]com
 *
 * Usage: 
 * $('.helpdiv').helpBox({
 *    helpContent:'<p>help content</p>',  // jQuery Selector or plain text HTML.
 *    contentCls:'help-content',        // CSS Class applied to the help box.
 *    buttonCls:'help-button',          // CSS Class applied to the help button.
 *    buttonText:'Help'                   // Help Button text
 * });
 */
(function($){

    $.fn.extend({

        helpBox: function(options) {

            var defaults = {
                helpContent:'<p>help content</p>',  // jQuery Selector or plain text HTML.
                contentCls:'help-content',        // CSS Class applied to the help box.
                buttonCls:'help-button',          // CSS Class applied to the help button.
                buttonText:'Help'                   // Help Button text
            }

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

            return this.each( function() {

                var o = options
                
                // Gets help content
                var content = ( $(o.helpContent).size() > 0 ) ? $(o.helpContent).html() : o.helpContent;
                
                // Appends help box and help button
                $(this).append("<div class='"+o.contentCls+"'>" + content + "</div>")
                      .append("<div class='"+o.buttonCls+"'><a href='javascript:void(0)'>"+o.buttonText+"</a></div>");

                $(this).find('.'+o.contentCls).hide();

                // Open the box on button mouseover, close it on click
                $(this).find('.'+o.buttonCls+' a').mouseover( function() {

                    $(this).parent().prev('.'+o.contentCls+':hidden').slideDown();
                }).click( function() {
                    
                    $(this).parent().prev('.'+o.contentCls+':visible').slideUp();
                });
            })
        }
    })
})(jQuery)