One way would be to store the HTML in a marker Property rather than
holding it with Function Closure.

function createMarker(point,html) {
  var marker = new GMarker(point);
  marker.Html = html;   // store the html in a Property
  GEvent.addListener(marker,"click",function() {
    marker.openInfoWindowHtml(marker.Html); // Use the stored html
  });
  gmarkers.push(marker);
}

Then at any time in your code you can change the stored information

  gmarkers[3].Html = "New text for marker 3";

Javascript allows you to add your own Properties to Objects. I recommend
avoiding property names that start with lower case letters, because
there's a slight possibility that they might clash with a Property name
used in the Google code of some future API release.

-- 
http://econym.org.uk/gmap
The Blackpool Community Church Javascript Team


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