I have the Philips 32pfl6606h tv, a panasonic HTS and cisco DVR. HTS is connected to tv through HDMI 1 (ARC) and the DVR is connected to tv through HDMI 2. My problem:

When watching tv through the cisco DVR the tv is obviously set to HDMI 2. When the HTS is activated to redirect the sound through my HTS speakers, the tv automatically switches to the HDMI 1 channel, where the HTS is connected, and the tv picture is lost. I then have to select HDMI 2 on my tv again to see the picture from the DVR. My question:

How can I prevent that the tv automatically switches to HDMI 1 when the HTS is activated?????

Thanks