[jQuery] Can I access/change a variable in a plugin?

[Joel Taylor]

Hi, so, I have a pretty basic plugin, and I'm trying to access a
variable that's set when the plugin is initialized. I'd also like to
change that variable on the fly.

Is it possible?

(function($) {
        $.fn.plugin = function(options){
                // default settings
                var settings = {
                        marginLeft : 10,
                        identifier : 'om',
                        xidentifier : 'omx',
                        height : 200,
                        width : 200
                }
                //extending options
                options = options || {};
                $.extend(settings, options);

                this.each(function(i){
                        // do something
                });
        }
})(jQuery);

$('div').plugin();
$('div).data('marginLeft'); ????

Thanks for any help!