Need help with bone mapping

[Reatus]

Hi Vizard community,

I am new to python and especially Vizard and created a bone mapping script for research in a student project at university.
However I have a problem:
My arms move up, when I move them down and vice versa.

The following snippet is what I think causes the problem, but I cannot figure out the correct Eulers:

kinectToCharacter = {	'Bip01 L UpperArm':(leftShoulder, [0, 90, 0]), \
						'Bip01 L Forearm':(leftElbow, [0, 90, 0]), \
						'Bip01 R UpperArm':(rightShoulder, [0, -90, 180]), \
						'Bip01 R Forearm':(rightElbow, [0, -90, 180]), \
						'Bip01 L Thigh':(leftHip, [90, 0, -90]), \
						'Bip01 L Calf':(leftKnee, [90, 0, -90]), \
						'Bip01 R Thigh':(rightHip, [90, 0, -90]), \
						'Bip01 R Calf':(rightKnee, [90, 0, -90]), \
						'Bip01':(waist, [0, 90, -90]) \
					}
bones = {}
for boneName in kinectToCharacter:
	b = avatar.getBone(boneName)
	b.lock()
	bones[b] = kinectToCharacter[boneName]


def animate():	
	for bone in bones:
		kinectTracker = bones[bone][0]
		euler = kinectTracker.getEuler()
		m = vizmat.Transform()
		m.setEuler(euler)
		m.preEuler(bones[bone][1])
		bone.setEuler(m.getEuler(), viz.ABS_PARENT)

Oh and I am using FAAST and thus VRPN to get data from a Microsoft Kinect for Windows.

Interesting fact that might help solving my problem:
If I exchange the arms they move correctly up and down, but are obviously on the wrong side of the avatar.

To any mods/admins:
I did not know where to put this, so if this thread is in the wrong place please contact me to clarify any issues.