I am a newbie to this site but it looks great!

I have brought a Panasonic SC-PT450 home theater sound system and I am unsure how to link this up with my SkyHD box. When I connect my HD TV with the SC-PT450 the DVD up scaling and surround sound is amazing but I can’t figure out how to get surround sound working when watching Sky?

Is there a cable I need or a setting I’ve not done? I have tried a scart lead from the SC-PT450 to Sky and then a HDMI cable from Sky to the TV but that doesn’t work! The TV only has one HDMI port (as does Sky) and I don’t want to lose the HD quality from Sky. Is there an audio cable that could go from the TV to the SC-PT450 that would work?

Any help would be much appreciated!