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alexchexes,
возможно просто уберите с

 win.on('resize', function(e){

и в строке 4-5 задайте ту величину что Вам надо , типа

// Monitor window resizing or changing device orientation
  

    var width = 100,
      height = 100,
      gallery_width, gallery_height,
      difference;

    // How many photos can we fit on one line?
    max_w_photos = Math.ceil(width/photo_default_size);

    // Difference holds how much we should shrink each of the photos
    difference = (max_w_photos * photo_default_size - width) / max_w_photos;

    // Set the global width variable of the pictures.
    picture_width = Math.ceil(photo_default_size - difference);

    // Set the gallery width
    gallery_width = max_w_photos * picture_width;

    // Let's do the same with the height:

    max_h_photos = Math.ceil(height/photo_default_size);
    difference = (max_h_photos * photo_default_size - height) / max_h_photos;
    picture_height = Math.ceil(photo_default_size - difference);
    gallery_height = max_h_photos * picture_height;

    // How many photos to show per page?
    per_page = max_w_photos*max_h_photos;

    // Resize the gallery holder
    gallery.width(gallery_width).height(gallery_height);

    gallery.trigger('window-resized');