> But I am trying to return markers, so how do I make the map place the
> text returned by the xmlhttp request as markers on the existing map?

This is where you have some javascript that receives whatever the php
script sends ; parses it ; and actions whatever is needed - like
removing any existing markers from the map and replacing it with new
ones based on the recieved data.
This is outlined in our old friend
http://code.google.com/apis/maps/articles/phpsqlajax_v3.html#createmap

I really suggest revisting
http://econym.org.uk/gmap/example_map11a.htm
which seems to me to be very close to what you are asking for.

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