Maya to Collada animation export problems

hello everybody!
I’m new in this forum so excuse me if this question has already been asked…
I’m using MAYA 2011 and am having problems exporting animations in a “.dae” format.
I’m having the following problem:
when I export a mesh with animated joints, every joint has a single animation node, instead of there being one animation node for the entire rig. this problem happens when i use dae_fbx exporter and even using opencollada for maya 2011.
is there any kind of way to solve this problem? maybe some setting that I have overlooked?
thank you