var ss = LoadSpriteset("some_spriteset.rss");var newss = CreateSpriteset(ss.images[0].width, ss.images[0].height, num_images, ss.directions.length, num_frames): //num_frames and num_images will depend on the spritesets to be combined.for(var i = 0; i<newss.images.length; i++){ newss.images[i] = ss.images[i] //also take from the other spritesets}