Try this one:
http://www.youtube.com/watch?v=gN2T5YM3orw
To spell it out:
Open your image in photoshop
Copy the image onto a new layer (Ctrl J)
With the new layer selected add a layer mask (darkish rectangle with pale circle in the bottom of the layers pallette. Or, Layer > Layer Mask > Reveal All)
Set foreground colour to black, background colour to white
Select Gradient tool and check that tool is set to linear gradient from the options in the top toolbar
With Layer 1 selected (the copy of the layer), set the layer blend mode to multiply
Start at the bottom of the frame and drag the line for the gradient tool upwards in the image
Experiment with start point, end point and layer opacity until you get the effect you want.