local alt = targetAltitudeFn
local tgl = ag.toggle

local vert = {
  -- x{min, max}, y{min, max}, act{fn, arg1}
  {x = {72, 77}, y = {19, 27}, act = {tgl}},
  {x = {30, 34}, y = {21, 32}, act = {alt, -10000}},
  {x = {30, 34}, y = {34, 42}, act = {alt, -1000 }},
  ...
}


if screenId == screenVert then
  for i = 1, #vert do
    local v = vert[i]
    local X, Y = v.x, v.y
    if    x > X[1] and x <= X[2] 
      and y > Y[1] and y <= Y[2] then
        v.act[1](v.act[2])
    end
  end
end

x = {1,2,3}
b = 2
a = load("print x["..b.."]")
a()

{1=1,2=2...}