Can I use two HDMI displays with Macbook Air?

I currently have one HDMI display connected to my Macbook Air, using an HDMI adapter plugged into the Displayport. I want to connect a second, larger monitor for alternate use when I have people in my office.

How can I connect the second display, short of unplugging one and pugging in the other? Is there some type of splitter or switch that I can use on the HDMI adapter? Ideally I'd me able to mirror both simultaneously, but switching back and forth would also work.

Thanks.