Tried the slideshow option...doesnt work for me. I did get a curtain made today. Bought some light weight netting and sewed a sleeve on the top....Bought a dowel and inserted it through the sleeve... Have it over lapping like yours shows in the middle. Dick figured out away to have it fitting tight against the upper door frame. Just might need a couple of magnets to keep it tight against the sides of the door frame.
May not be the prettiest curtain but I think it should work out ok...to keep out the bugs and let a bit of breeze in.
Thanks for posting the picture...helped me figure out how to do it.