What can I do to attach a filter to the Lumix 7-14mm Micro4/3 Lens?

[GraphicPlanet]

Does anybody know how I can attach a filter to the Lumix 7-14mm Micro4/3 Lens? Is there a step up ring that will clear the glass bubble of the lens?

 

[greeches]

http://forums.dpreview.com/forums/read.asp?forum=1022&message=36893455

 

[GraphicPlanet]

Thanks!