GX1 - Canon EF Lens Adapter

I have recently gotten a Panasonic GX1, which I am very happy with since its very compact and in that case better than my DSLR (canon 550D). I have 3 lenses which I want to use with my GX1. Lenses are Canon EF/EF-S.

Please suggest me a good lens mount adapter which wont harm the lenses or the camera.