If you look at the documentation, the method addMarkers() requires a
minZoom parameter which you are not passing:
addMarkers(markers,  minZoom,  maxZoom?)
http://gmaps-utility-library.googlecode.com/svn/trunk/markermanager/release/docs/reference.html

--
Marcelo - http://maps.forum.nu
--



On Aug 31, 10:37 pm, John <[email protected]> wrote:
> I plot about 100 points on a map without MarkerManager and it works
> fine:
>    http://wildfirealert.sdsu.edu/zipcodes.php
> But when I add a few lines to use MarkerManager, it stops working:
>    http://wildfirealert.sdsu.edu/zipcodes2.php
>
> Help!
>
> -John
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