Brilliant. Thanks chaps :) The question now becomes: is there any preference between using OpenLayers.Layer.MapGuide and OpenLayers.Layer.WMS (which I've been using up until now)? The WMS is simpler to implement (no session ID required). Furthermore there's this warning from the MapGuide class's API documentation:
"NOTE: untiled overlay layers issues a synchronous AJAX request before the image request can be issued so the users browser may lock up if the MG Web tier does not respond in a timely fashion." If the WMS call isn't synchronous (is it?), then there appears to be two good reasons to use it instead of the MapGuide class. Thoughts? -- View this message in context: http://n2.nabble.com/MapGuide-overlay-session-ID-requirements-tp2169448p2171721.html Sent from the OpenLayers Users mailing list archive at Nabble.com. _______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users