How to change image path with MaxImage jQuery plugin?

I'm trying to set Maximage Plugin for a website. Everything seems to work fine except that my images are not displaying because the path generated via maximage JS render : url('img/your-image'), and I need to have this path : url('../img/your-image'). I can't figure where exactly change the variable to get the path I need.

I guess it should be here, but nothing works...(the code is from the jquery.maximage.js file if you need it all.

// Set our image
                        var $img = $.Slides[i];

                        // Create a div with a background image so we can use CSS3's position cover (for mode browsers)
                        $self.append('<div class="mc-image ' + $img.theclass + '" title="' + $img.alt + '" style="background-image:url('' + $img.url + '');' + $img.style + '" data-href="'+ $img.datahref +'">'+ $img.content +'</div>');
                    }

// Create new image object
                var $img = $('<../img/>');

Thank you so much in advance to anyone who can help!