The nsITextScroll is an interface that can be implemented by a control that
supports text scrolling.
Scroll the view up or down by aNumLines lines. positive
values move down in the view. Prevents scrolling off the
end of the view.
| numLines | number of lines to scroll the view by |
Scroll the view up or down by numPages pages. a page
is considered to be the amount displayed by the clip view.
positive values move down in the view. Prevents scrolling
off the end of the view.
| numPages | number of pages to scroll the view by |