vertical scroll bars for text

I need to make a site with an area of text that scrolls in its box when you
hover your curser over an 'up' or 'down' image.

I think i need to do this with javascript but it might be java. This is
probably too complex for someone to post an entire tutorial here, but could
someone provide me with a link to one? Ive been searching for a while without
finding anything but im sure there are tutorials out there one this.
thanks
james