Panorama scrolling show/hide border arrows

-- left part

-- acquire left cursor position
local posleft = getCursorPos()

-- hide left cursor if left screen border reached
if posleft.x < 5
then
local cond = getObject("Conditions[Show_Left_Arrow?]")
 cond:setValue(VConditionValue, false) 
end

-- show left arrow if cursor scrolls to the right
if posleft.x > 1920
then 
local cond = getObject("Conditions[Show_Left_Arrow?]")
 cond:setValue(VConditionValue, true) 
end

-- right part

-- acquire right cursor position
local posright = getCursorPos()

-- hide right cursor if right screen border reached
if posright.x > 3995
then
local cond = getObject("Conditions[Show_Right_Arrow?]")
 cond:setValue(VConditionValue, false) 
end

-- show right arrow if cursor scrolls to the left
if posright.x < 2080
then 
local cond = getObject("Conditions[Show_Right_Arrow?]")
 cond:setValue(VConditionValue, true) 
end

if ( game.ScrollPosition.x + getCursorPos().x ) < 5 then 

if game.ScrollPosition.x == 0 then
 -- hide left arrow
elseif game.ScrollPosition.x >= (scene_width - game.ScrollPosition.x) then
 -- hide right arrow
else
 -- show left arrow; show right arrow
end

scnSize = nil -- empty variable that we will be storing the scene size into...

-- * call this function once at the beginning of each interactive scene * --
function getSceneSize()
 scnSize = game.CurrentScene.SceneSprite.SpriteSprite:getSize()
end

function navArrows()
 if not game.CurrentScene:getBool(VSceneIsMenu) and scnSize ~= nil then
  if game.ScrollPosition.x == 0 then Conditions["Show_Left_Arrow"].ConditionValue = false else Conditions["Show_Left_Arrow"].ConditionValue = true end
  if game.ScrollPosition.x >= (scnSize.x - game.WindowResolution.x) then Conditions["Show_Right_Arrow"].ConditionValue = false else Conditions["Show_Right_Arrow"].ConditionValue = true end
 end
end

registerEventHandler("mainLoop", "navArrows") -- create the loop

scnSize = nil -- empty variable that we will be storing the scene size into...
local scn = nil

-- * call this function once at the beginning of each interactive scene * --
function getSceneSize()
 scnSize = game.CurrentScene.SceneSprite:getSize()
end

function navArrows()
 if not game.CurrentScene:getBool(VSceneIsMenu) and scnSize ~= nil then
  if game.ScrollPosition.x == 0 then Conditions["Show_Left_Arrow"].ConditionValue = false else Conditions["Show_Left_Arrow"].ConditionValue = true end
  if game.ScrollPosition.x >= (scnSize.x - game.WindowResolution.x) then Conditions["Show_Right_Arrow"].ConditionValue = false else Conditions["Show_Right_Arrow"].ConditionValue = true end
 end
 -- + --
 if scn ~= game.CurrentScene:getName() and not game.CurrentScene:isEmpty() then 
  scn = game.CurrentScene:getName(); startAction("Actions[get_scene_size]")
 end
end

registerEventHandler("mainLoop", "navArrows") -- create the loop