[mephisto73]

Löste det själv, för ev. framtida referens:

function GeoDecode(position) {  
		    	var oRequest = new XMLHttpRequest();
		    	if (position.coords.accuracy<500) {
					var sURL  = "geodecode.php?lat="+position.coords.latitude+"&lon="+position.coords.longitude;
					
					oRequest.open("GET",sURL,false);
					oRequest.setRequestHeader("User-Agent",navigator.userAgent);
					oRequest.send(null);
			    	document.getElementById('adress').value = oRequest.responseText;
		    	}
		    }
		document.addEvent('domready', function() {
			if (navigator.geolocation) { 
		    	    // Geo request
		    	    navigator.geolocation.getCurrentPosition(GeoDecode);
			}
		});