> have tried putting this poly.openInfoWindowHtml(html);

We don't know what 'poly' is as you have ignored the posting
guidelines and there isn't enough context in your code snippet
  
http://groups.google.com/group/Google-Maps-API/web/suggested-posting-guidelines
I could guess that 'poly' is a GPolyline object though.  GPolylines
don't have a .openInfoWindow() method
  
http://code.google.com/apis/maps/documentation/javascript/v2/reference.html#GPolyline
perhaps because the API would have to guess exactly where you wanted
the infowindow to open.
You can open one on the map, but it is up to you to specify the point
where you would like it to appear.
  
http://code.google.com/apis/maps/documentation/javascript/v2/reference.html#GMap2.openInfoWindow

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