Thanks LY7E7 - Read the following info - they tell you at check in which lounge is yours (jpost.com 2/11/04)
There are three concourses, B (farthest to the left), C (center) and D (farthest right). Two more concourses, A and E, will eventually be built, once the current terminal requires expansion. Each concourse has eight gates with airbridges, and two for buses, just in case the terminal is overloaded with flights.
Concourse D serves El Al. Here you will board all flights by the national carrier, and enter its King David Lounge. El Al has 16 departing flights and five arriving flights on Tuesday. Most foreign carriers have scaled back their services to Israel, just for the first day of Terminal 3's operation.
Aside from the King David Lounge, there are two lounges for premium passengers, those flying First or Business Class. One is in B, and the other in C. Ground staff at check-in will advise the passenger which lounge they are entitled to enter.
Regarding gate locations, Continental Airlines, Swiss and British Airways have already advised their passengers of the concourse area, which is C.