setTimeout(sessionKeepAlive, 600000);

function sessionKeepAlive()
{
	$j.ajax({
		type: "GET",
		url: "/sessionKeepAlive.php?xcache=" + Math.random(),
		success: function(){ setTimeout(sessionKeepAlive, 600000); },
		error: function(){ setTimeout(sessionKeepAlive, 60000); }
	});
}