gallery problems

hi! so im having problems with the gallery. 1 problem- when you click on the first image instead of it show an arrow to move forward it shows a arrow to moves back. if it is the first image the arrow need to point to the next image. 2 problem. when you click to see the next image the whole pages moves, which is annoying. i need the gallery to remain in the same position so people can move through the images. http://69.195.124.63/~kzinteri/girls-bedroom-lara/