i agree with Forlorn. Scan lines make an image look good. or u can even put it as proffesional.
BTW, that's a good tutorial, but well here's the esaier way -
create a new file, about 10x5 pixels. now zoom in and draw the two lines u need for scan lines and give them the colors. then goto edit>> Define patter and save the pattern. now open the document and goto Edit >>Fill and select the pattern. then get it in the background(or reduce its opacity) and placy with it..