By default, jPages show items one by one with a delay of 50 millisenconds between each item, creating a wave effect. You can customize this delay or even set it to 0 if you don't want this feature, but if you keep the delay you can also choose in what order or "direction" will the items be displayed. You have the following options:
forward - Start displaying items from the left.
backwards - Start displaying items from the right.
auto - Start displaying items from the left if you move to a page on the right and from the right if you move to a page on the left.
random - Display items randomly.