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There are also a number of tutes out there, which should only take a few seconds to work through, as scan lines are pretty "idiot proof".
I'm at work at the moment (and not supposed to be here [shhh] ), otherwise i'd write a mini tute for you. If you'd like one let me know, and i'll post it - but i really don't think you'll need it. You'll see... the loving family here will be all over you before I get a chance to check back in.
Good luck and cheers, enjoy this beautiful (although somewhat dreary) day!!!
Create a layer mask on the layer with the scanlines and then take a gradient and drag it on top of the layer. The gradient won't show up but you will be left with this fading effect.
That is a really quick run down of how to do it because I ave to go to school but, if you want more help just yell.
You can also use layer clipping which gives you a little more control. Take your scanlines layer and create a new blank layer under it. Then, while holding down your alt key, cick the line between the two layers. Your top layer will dissappear and change appearance in the layers pallette. Now, whatever you paint on the bottom blank layer will make whatever is in the top layer appear. Try loading a the layer transparency SELECT>LOAD SELECTION and load the layer transperancy for the scanlines layer, then use a color to transparent grandient on the blank layer to make them fade professional like. Hope this helps.
Making these scanlines and fade out 
Linear Mode
