Hook up i have a phlips tv 3 scart s.a ntl box and a panasonic dvd recorder.how do i hook them up/thanks

Well u cannot hook almost any devices with the SC-HT500.
I have this homecinema system for 5 years now, and i had to buy another stand alone DivX player to hook it up, but can't get the sound in dolby from the standalone player since the panasonic SC-HT500 has only 2 analog stereo RCA ports (audio in) in the back and a scart (A/V out) and component video (Video out).
At that time it was a very good system, but since i have bought a Full HD LCD tv with 1080p capabilities, I realised that my home cinema system i.e the Panasonic SC-HT500 is kind of useless, in the sense that you cannot even change the player for another one since the whole spaker and power connections are made trhough a special cable from the subwoofer. :(
best solution is that put the system back in a corner and get a new system which is not an all-in-one system. Preferrable get home cinema systems that come with a receiver, separate dvd player and speakers and subwoofer hooked to the receiver.
you asked how to hook these devices to your tv,, well the panasonic dvd recorder is better if you connect it via HDMI cable if you can. In the other case, connecting them with a scart cable would be another solution.