HDMI question - using two systems on one monitor?

Hi guys

Please help - quick question.

I currently have a 24" ASUS HDMI monitor. The monitor is hooked via HDMI to my PC through an ATI HDMI Card (hdmi 2 hdmi - no crappy hdmi to dvi)

What I want to do is buy a playstation 3 and hook that up to the monitor via HDMI - my monitor only has one hdmi port - I dont want to keep plugging and switching all the time - any suggestions would be great.

Thanks