A photo of the space would help.
If it's triangular/trapazoidal, as in the photo you referenced, and you want a cord-operated mechanism, the only solution I can think of would involve drawing the curtains toward the top, since otherwise they run into the floor ... unless you can come up with some really weird mechanism to bundle the curtain as it moves. Of course the whole thing doesn't have to move, just the portion you need easy access to.
Alternative solution: Rather than moving the curtain to the side, roll/gather it upward and tie it in place, as was done with the sides of old tents. Simple and effective.