[OpenLayers-Users] A question of control

[Ted Scott]

Hey, I'm new to OL and stood up a simple stack to gain familiarity 
before diving into my projects whole hog. In addition to the normal 
learning pains, I keep getting errors when attempting to create a new 
map control. Specifically, I get "TypeError: 
OpenLayers.Control.OverviewMap is not a constructor" when trying to 
create an overview map control, but this isn't the only control this 
will happen with. The exact same call works in the OL demo pages 
included with GeoServer, so, this should work, but alas it does not.

I'm using the OL library that shipped with GeoServer 1.7.2 which I think 
is OL 2.6

The other thing I noticed is that when I have firebug 1.3 enabled, it's 
like the init() is never called from the body tag onload attribute.

So since I can't seem to be able to drive it with firebug, how do I go 
about troubleshooting this?