You can't get at the internal API variables that control the marker 
size. What you can do is switch the marker for a different one that has 
the large size.

You only need one special large marker. Use .hide() to hide the small 
marker, and keep a reference to it. Use .setLatLng(), .setImage() and 
.show() to position your large marker in the correct place and reveal 
it.

If the user clicks on your large marker, use GEvent.trigger() to pass 
the click down to the hidden marker to which you kept a reference.

To unzoom, reverse the process by calling .hide() on the large marker 
and .show() on the small marker.


If you need more help, put your code that doesn't work onto a publicly 
accessible webserver somewhere and post a link.

-- 
Mike Williams
http://econym.org.uk/gmap



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