var
	_latitude = 37.535053;
	_longitude = 127.147263;
	_callback = null;

function getPositionByGeo(pos)
{
	_latitude = pos.coords.latitude;
	_longitude = pos.coords.longitude;

	_callback(_latitude, _longitude);
}

function getPositionByIP()
{
	var xhr = new XMLHttpRequest();
	var dat = new FormData();

	dat.append("order", "geolocation");

	xhr.open("POST", "/geo.php");
	xhr.send(dat);

	xhr.onload = function()
	{
		if(xhr.status === 200 || xhr.status === 201)
		{
			var res = JSON.parse(xhr.responseText);

			if(res.latitude&&res.longitude)
			{
				_latitude = res.latitude;
				_longitude = res.longitude;

				_callback(_latitude, _longitude);
			}
		}
	};
}

function getPosition(callback)
{
	_callback = callback;

	if (navigator.geolocation)
		navigator.geolocation.getCurrentPosition(getPositionByGeo, getPositionByIP);
	else
		getPositionByIP();
}