For video, try simply connecting your laptop S-video OUT to the Philips screen S-video IN, using a standard S-video cable (various lengths available from, say, Maplin).
If that doesn't work first time, two things to check:
1) You may need to 'enable' the laptop video OUT. On some laptops, you need to press a 'Video' key to toggle the display from the laptop screen to the S-video OUT port (then press again to return video to the laptop screen). Check the Dell user-guide.
2) On the Philips screen, you /may/ need to select the S-video IN port. Check the Philips user-guide.
On the audio, you may well find the laptop speaker will still work as normal.
If not, can you use headphones, plugged into the headphone socket? You may even find this is in stereo!
Failing that, you could try connecting the laptop headphone socket to the LCD screen audio IN connection, using a stereo audio cable, with jack plugs at each end (probably 3.5mm).
If the Philips unit audio IN is a stereo socket but the laptop headphone socket is mono, that should still work (in mono).
But note that the laptop headphone socket sound level may be too low to drive the speaker(s). If the sound level is too low, you could then use 'active' speakers, i.e. ones with an internal amplifier.
HTH, and I'd be interested to know how you get on.