Continuous scroll menu

i am trying to make a menu that has a continuosly scroling image below it. when you hit one of the navigation buttons, the image scrolls to a certain spot. i can see this being done with _x values but can't seem to get it together.

anyone, please?? thanks!

ex:

_btn1_ _btn2_ _btn3_

XXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXX
scrolling image

Is it continuouly scrolling or scrolling to certain spots and then stopping based on the button clicks?

continuously scrolling, then scrubs to certain places in the image when you click one of the buttons.

thank alot for the reply!