own.propertyname in Blender 2.5


I am trying to “convert” my old scripts to new Blender. However I stumble accros property management.

I use “own.propertyname” in my scripts a lot, but in new Blender I keep getting error message ‘KX_GameObject’ object has no attribute ‘propertyname’

What am I supposed to do? Also, is there any tutorial/document that contains differences between 2.49 and 2.5?

Thanks a lot!