Sorry! Another Scanlines Question

Anybody else have problems with diagonal scanlines @ 1024 x 768 res. ???
All looks great @ 1280 x 1024 _ but i know this is no where close to average users resolution . So does anyone know how to get scanlines to look good
on smaller res. ? Im using the ol’ 3x3 ps trick and having that as a repeating
bg on my page and like i said all looks great @ 1280 x 1024 or higher .