Amend an existing Google Map object

Hi, I have a question about Google Maps - apologies if this is obvious. Is it possible to refer to an existing map in the UI, and amend it, or do I need to create a new map each time I change it?

All the examples I have seen require creating a new instance of a map object. I don't want to do this, as I just want to add (say) markers to an existing map.

If I do have to create a new map instance each time I change it, then presumably I would have to supply all the options such as location, zoom level etc in the constructor; how can I get those values from the original map object?
Thanks
Peter
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