Oh they are easy to do.... Just make an image like 1X1 pixel high (Or however tall you want the scan lines) and the length of the picture your going to put them on, and make the bottom pixel length transparent and then use the fill with pattern option in PS and play with the layers... Well I probably didn't explain it very well, but thier are many tutorials on how to do it, all are almost exactly alike... Try www.designsbymark.com or err I would say www.screamdesigns.com but they charge now. Pretty easy tutorial to find though.