alt foot print

masks/messages.html

@@ -20,7 +20,7 @@ oSpot.pageInit = function(asHash)
 								.prop('outerHTML');
 			var sLatLng = [oMsg.latitude, oMsg.longitude];
 			var asData = {title:oMsg.timestamp, details:sInfoWindow};
-			var asOptions = {icon:'images/footprint.png'}
+			var asOptions = {icon:(iKey%2==0)?'images/footprint_alt.png':'images/footprint.png'};
 			aoMessages.push({id:oMsg.id_message, latLng:sLatLng, data:asData, options:asOptions});
 		});