Exporting texture coordinates from SketchUp is tricky. There are other exporters you can try - I've seen some that do it right.
Unfortunately I don't have time to fix this.
Fixing the comma problem would be easier, but at the moment I can't promise anything...
Subscribe to this thread. If I'll find time to improve this exporter I'll post an update here.

This plugin is a simple exporter that can export Sketchup models to DirectX .X, Ogre3d .mesh.xml or WaveFront .Obj file formats.
It's intended to be used on small models. On very big models exporting can take a very long time, and possibly fail. Bug reports are welcome.

It's tested on SketchUp 8.0

http://www.scriptspot.com/sketchup/scripts/zbylsxexporter
ZbylsXExporter.rbz