Dynamic text field scrollbar (not component)

hello,

i would like to create a scrollbar for a dynamic textfield but do not want to use the common component.

i found this script:

http://www.flashdesignerzone.com/tutorials/t1033.php

it seems very easy, but don’t manage to have it work … and i don’t understand how it manages the scrolling. it’s only the 4 most essential lines i do not understand.

regards,
.d