I have a layered image in CS5 and want to send to Bridge to use the Camera raw sliders and brush tools, and the bring the image layer back into CS5.
You can't...Camera Raw can only open flattened JPEG & TIFF files. If you save off one of those layers as a flattened TIFF you could then open in ACR, adjust and then re-instert that file as a layer back in the layered file but that seems like a lot of work for little gain.