I want to achieve a fade effect with certain images, so that the right side of the image looks normal, but it slowly fades to white as it goes to the left, until it is fully white on the left.

I'm no graphical expert, but I assume this would be accomplished by putting an image on the bottom, then the gradient ontop. This is assuming theres a way to make the gradient on the top fade to transparency. I have no idea how this is done, anyone want to fill me in? Thanks!