geez...you guys are really new to Ps eh? just make the damn pattern yourself.....make a 3x3 pixel new document, transparent and put 3 pixels from one corner to the other then go into Edit->Define Pattern then you can just save it and BAM you got yourself a scanline pattern:
[IMG]http://img.photobucke*****m/albums/v470/Chronologix/misc/pat.jpg[/IMG]