initial commit - cross reference with 5th port - obviously has compile errors

code/game/objects/effects/bump_teleporter.dm

@@ -0,0 +1,34 @@
+var/list/obj/effect/bump_teleporter/BUMP_TELEPORTERS = list()
+
+/obj/effect/bump_teleporter
+	name = "bump-teleporter"
+	icon = 'icons/mob/screen_gen.dmi'
+	icon_state = "x2"
+	var/id = null			//id of this bump_teleporter.
+	var/id_target = null	//id of bump_teleporter which this moves you to.
+	invisibility = INVISIBILITY_ABSTRACT 		//nope, can't see this
+	anchored = 1
+	density = 1
+	opacity = 0
+
+/obj/effect/bump_teleporter/New()
+	..()
+	BUMP_TELEPORTERS += src
+
+/obj/effect/bump_teleporter/Destroy()
+	BUMP_TELEPORTERS -= src
+	return ..()
+
+/obj/effect/bump_teleporter/Bumped(atom/user)
+	if(!ismob(user))
+		//user.loc = src.loc	//Stop at teleporter location
+		return
+
+	if(!id_target)
+		//user.loc = src.loc	//Stop at teleporter location, there is nowhere to teleport to.
+		return
+
+	for(var/obj/effect/bump_teleporter/BT in BUMP_TELEPORTERS)
+		if(BT.id == src.id_target)
+			usr.loc = BT.loc	//Teleport to location with correct id.
+			return