Quote (Sacred_Angel @ Jun 16 2011 12:50am)
alright, so the easiest way would be to take out the block you have the level on so its like a window, then set the lever inside so you can reach it from both sides.
the more complicated way would be to make a sort of redstone circuit like this.

basically this is the functional unit, the redstone torch in the front will only lite when both switches are turned on (thus open a door), so you need to route redstone from each lever to a unit such as this, and then rout the output to the door.
here is an example of putting most of it underground.


you can see functional unit because i left it uncovered, and the red cloth represents where i placed redstone (about 2 blocks, sometimes 3 blocks down from there)