timeout.js

var timeout = 30 * 1000;
var lastKeyPress = +(new Date());
setInterval(update, 100);

function update()
{
	var diff = +(new Date()) - lastKeyPress;
	
	if(diff > timeout)
		window.location.href = "../..";
}

window.addEventListener("keyup", function()
{
	lastKeyPress =  +(new Date());
});