function enemys.hit_rightWall_event(self, event, movement)  -- should be called when 'Enemy' hits the right wall
	self.movement  = -self.movement
	self.numberOfWallHits = self.numberOfWallHits + 1
	checkNumHits(self)
end
 
function enemys.hit_leftWall_event(self, event, movement)  -- should be called when 'Enemy' hits the left wall
	self.movement = -self.movement
	self.numberOfWallHits = self.numberOfWallHits + 1
	checkNumHits(self)
end
 
function enemys.collision(self, event, movement)
	if event.phase == 'began' then
        if event.other.name == "leftWall" then
			scene:dispatchEvent{name="hit_leftWall_event"}
        elseif event.other.name == "rightWall" then
			local message = {name="hit_rightWall_event"}
			scene:dispatchEvent{name="hit_rightWall_event"}
        elseif event.other.name == "floorWall" then
            loadAd()
        elseif event.other.name == "bullet" then
			--if(enableSound) then
				enemyShotChan = audio.play(shot,{channel=7 })
			-- end
  
			event.target:removeSelf()
			removeArrayItem(self)
			timer.cancel(self.clock)
 
			scene:dispatchEvent{name="enemyDead"}
			Runtime:removeEventListener( "enterFrame", self )
			self.image:removeEventListener( "collision", self ) --DISPATCHING AND NULLING THE INVADER
			scene:removeEventListener('hit_rightWall_event', self)
            scene:removeEventListener('hit_leftWall_event', self)
			scene:removeEventListener('hit_floorWall_event',self)
        if self.image.y ~= drop then
            local explosion2 = display.newSprite(budSprites2.sheets.explosion, budSprites2.sequences.explosion)
            explosion2:scale(1.5, 1.5)
            explosion2:play()
			explosion2.x, explosion2.y = self.image.x, self.image.y
 
			timer.performWithDelay(260, 
				function()
					if explosion2.removeSelf then
						explosion2:removeSelf()
					end
				end
			)
        end
 
		local currentScore = getScores( )

		-- EFM SCORES - Extract scores from enemies and add to current score
		local myValue = self.myValue
		--print("Bang you got: ", myValue, " points" )
		currentScore = currentScore + myValue
		setScores( currentScore )

		end
	end
end