Writing Javascript Variable into <a href> - without onclick
===

I'm stuck on brain fart mode and can't seem to write a javascript variable to an A anchor href.  Ideas? I'm sure I'm missing something simple...

So Javascript is pulling GPS below - works fine...

I need it to populate the Lat and Long into an anchor href... Without an "onclick" - needs to populate automatically...

So: 

     <a href="page.htm?Lat=javascript(latitude)&Long=javascript(longitude)">GPS Location</a>

     javascript(latitude) - is variable I need to pull from below Javascript
     javascript(longitude) - is variable I need to pull from below Javascript

      <script type="text/javascript"> 
       function getLocationConstant()
	{
		if(navigator.geolocation)
		{
			navigator.geolocation.watchPosition(onGeoSuccess,onGeoError);	
		} else {
			alert("Your browser or device doesn't support Geolocation");
		}
	}

	// If we have a successful location update
	function onGeoSuccess(event)
	{
		document.getElementById("Latitude").value =  event.coords.latitude; 
		document.getElementById("Longitude").value = event.coords.longitude;

	}
 
	// If something has gone wrong with the geolocation request
	function onGeoError(event)
	{
		alert("Error code " + event.code + ". " + event.message);
	}
		
       </script>