diff --git a/init.lua b/init.lua
index 93be29a..d8e76fe 100644
--- a/init.lua
+++ b/init.lua
@@ -1,5 +1,11 @@
+local TELEPORT_MAX_DIST = 2606			-- maximum teleport distance in all directions
+local TELEPORT_SHOW_MAX = 6			-- maximum teleports shown in formspec
+local TELEPORT_FUEL = "default:mossycobble"	-- fuel item (note: if you change this,
+						-- you also need to change formspec text)
+local TELEPORT_INITFUEL = 30			-- initial fuel items for new teleports
+
 local S
-if minetest.translate then
+if minetest.get_translator then
 	S = minetest.get_translator("teleports")
 else
 	-- Compability translator code to support MT 0.4, which doesn't support
@@ -32,8 +38,6 @@ teleports.teleports = {}
 teleports.lastplayername =""
 teleports.filename = minetest.get_worldpath() .. "/teleports.txt"
 
-local TELEPORT_MAX_DIST = 260
-
 function teleports:save()
 	local datastring = minetest.serialize(self.teleports)
 	if not datastring then
@@ -169,26 +173,18 @@ end
 teleports.on_receive_fields = function(pos, formname, fields, player)
 	local meta = minetest.env:get_meta(pos);
 	local inv = meta:get_inventory();
-	local price = {name="default:mossycobble", count=1, wear=0, metadata=""}
+	local price = {name=TELEPORT_FUEL, count=1, wear=0, metadata=""}
 	if fields.tp1 or fields.tp2 or fields.tp3 or fields.tp4 or fields.tp5 or fields.tp6 then
 		if inv:contains_item("price", price) then
 			inv:remove_item("price", price);
 			teleports.lastplayername = ""
-			local available = teleports:find_nearby(pos, 6)
+			local available = teleports:find_nearby(pos, TELEPORT_SHOW_MAX)
 			if player ~= nil and player:is_player() then
 				local playerpos = player:getpos()
-				if fields.tp1 and #available>0 then
-					teleports.do_teleporting(playerpos, available[1].pos, player:get_player_name())
-				elseif fields.tp2 and #available>1 then
-					teleports.do_teleporting(playerpos, available[2].pos, player:get_player_name())
-				elseif fields.tp3 and #available>2 then
-					teleports.do_teleporting(playerpos, available[3].pos, player:get_player_name())
-				elseif fields.tp4 and #available>3 then
-					teleports.do_teleporting(playerpos, available[4].pos, player:get_player_name())
-				elseif fields.tp5 and #available>4 then
-					teleports.do_teleporting(playerpos, available[5].pos, player:get_player_name())
-				elseif fields.tp6 and #available>5 then
-					teleports.do_teleporting(playerpos, available[6].pos, player:get_player_name())
+				for i=1, TELEPORT_SHOW_MAX do
+					if fields["tp"..i] and #available>i-1 then
+						teleports.do_teleporting(playerpos, available[i].pos, player:get_player_name())
+					end
 				end
 			end
 
@@ -197,7 +193,7 @@ teleports.on_receive_fields = function(pos, formname, fields, player)
 	end
 end
 teleports.allow_metadata_inventory_put = function(pos, listname, index, stack, player)
-	if listname=="price" and stack:get_name()=="default:mossycobble" then
+	if listname=="price" and stack:get_name()==TELEPORT_FUEL then
 		return 99
 	else
 		return 0
@@ -224,11 +220,13 @@ minetest.register_node("teleports:teleport", {
 			local meta = minetest.env:get_meta(pos)
 			local inv = meta:get_inventory()
 			inv:set_size("price", 1)
-			local initialcharge = {name="default:mossycobble", count=30, wear=0, metadata=""}
-			inv:add_item("price", initialcharge)
+			if TELEPORT_INITFUEL > 0 then
+				local initialcharge = {name=TELEPORT_FUEL, count=TELEPORT_INITFUEL, wear=0, metadata=""}
+				inv:add_item("price", initialcharge)
+			end
 
 			-- Add formspec to self
-			local near_teleports = teleports:find_nearby(pos, 6)
+			local near_teleports = teleports:find_nearby(pos, TELEPORT_SHOW_MAX)
 			teleports.set_formspec(pos, near_teleports)
 
 			local sign_pos = minetest.find_node_near(pos, 1, {"default:sign_wall_wood", "default:sign_wall_steel"})
@@ -244,7 +242,7 @@ minetest.register_node("teleports:teleport", {
 			-- Update formspec of target teleports
 			for n=1, #near_teleports do
 				local pos2 = near_teleports[n].pos
-				local near_teleports2 = teleports:find_nearby(pos2, 6)
+				local near_teleports2 = teleports:find_nearby(pos2, TELEPORT_SHOW_MAX)
 				teleports.set_formspec(pos2, near_teleports2)
 			end
 
@@ -253,7 +251,7 @@ minetest.register_node("teleports:teleport", {
 	end,
 	on_destruct = function(pos)
 		-- Update list of teleports on destruction
-		local near_teleports = teleports:find_nearby(pos, 6)
+		local near_teleports = teleports:find_nearby(pos, TELEPORT_SHOW_MAX)
 
 		for i, EachTeleport in ipairs(teleports.teleports) do
 			if vector.equals(EachTeleport.pos, pos) then
@@ -265,7 +263,7 @@ minetest.register_node("teleports:teleport", {
 		-- Update formspecs of affected teleports
 		for n=1, #near_teleports do
 			local pos2 = near_teleports[n].pos
-			local near_teleports2 = teleports:find_nearby(pos2, 6)
+			local near_teleports2 = teleports:find_nearby(pos2, TELEPORT_SHOW_MAX)
 			teleports.set_formspec(pos2, near_teleports2)
 		end
 	end,