Portal.js

function updateNether() {
	var netherX = document.getElementById("nether-x");
	var netherZ = document.getElementById("nether-z");
	var overworldX = document.getElementById("overworld-x");
	var overworldZ = document.getElementById("overworld-z");
	netherX.value = Math.round((overworldX.value / 8));
	netherZ.value = Math.round((overworldZ.value / 8));
}
function updateOverworld() {
	var netherX = document.getElementById("nether-x");
	var netherZ = document.getElementById("nether-z");
	var overworldX = document.getElementById("overworld-x");
	var overworldZ = document.getElementById("overworld-z");
	overworldX.value = Math.round((netherX.value * 8));
	overworldZ.value = Math.round((netherZ.value * 8));
}