Infinite Menu with buttons instead of mouse

Hey everyone. So I’m down to the very last revision of a site I’m designing, and they want to change the infinite menu to use left and right buttons, rather than where the mouse is to make the thing scroll.

How do I translate this…

onClipEvent (load)
{
xcenter=400;
speed=1/20;
}
onClipEvent (enterFrame)
{
var distance=_root._xmouse-xcenter;
_x+=(distance*speed);
if (_x > 0) _x=-800;
if (_x < -800) _x=0;
}

…onto a left and right button that make it scroll the appropriate direction?

Could use this asap.

Thanks a ton

Evan