Hi there,
the following codes functions work only in this order: Press the stop button THEN press the start button

for some reason it does not fully work if I press the buttons in this order: start button THEN press the stop button

my question is, is it not working because of the order of the functions. Heres my code:

Code:
<!DOCTYPE html>
<html>
<body>

<p id="demo">Click the button to get your position:</p>

<button onclick="getLocation()">Try It</button>
<button onclick="stopLocation()">Stop</button>
<button onclick="additionStats()">Add</button>

<div id="mapholder"></div>
<script src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script>
var x=document.getElementById("demo");


function getLocation()
  {
  if (navigator.geolocation)
    {
    navigator.geolocation.watchPosition(showPosition,showError);
    }
  else{x.innerHTML="Geolocation is not supported by this browser.";}
  }



function showPosition(position)
  {
  lat=position.coords.latitude;
  lon=position.coords.longitude;
  latlon=new google.maps.LatLng(lat, lon)
  mapholder=document.getElementById('mapholder')
  mapholder.style.height='250px';
  mapholder.style.width='500px';

  var myOptions={
  center:latlon,zoom:14,
  mapTypeId:google.maps.MapTypeId.ROADMAP,
  mapTypeControl:false,
  navigationControlOptions:{style:google.maps.NavigationControlStyle.SMALL}
  };
  var map=new google.maps.Map(document.getElementById("mapholder"),myOptions);
  var marker=new google.maps.Marker({position:latlon,map:map,title:"You are here!"});
  }


function stopLocation(position)
{
  if (navigator.geolocation)
  {
  navigator.geolocation.getCurrentPosition(showStopPosition,showError);
  
  }
else{x.innerHTML="Geolocation is not supported by this browser.";}
}


function showStopPosition(position)
  {
  lat1=position.coords.latitude;
  lon1=position.coords.longitude;
  x.innerHTML="Latitude: " + lat1 + 
  "<br>Longitude: " + lon1;	
  }



function showError(error)
  {
  switch(error.code) 
    {
    case error.PERMISSION_DENIED:
      x.innerHTML="User denied the request for Geolocation."
      break;
    case error.POSITION_UNAVAILABLE:
      x.innerHTML="Location information is unavailable."
      break;
    case error.TIMEOUT:
      x.innerHTML="The request to get user location timed out."
      break;
    case error.UNKNOWN_ERROR:
      x.innerHTML="An unknown error occurred."
      break;
    }
  }






</script>


</body>
</html>