Do you need composite cable with universal dock or will dock allow you to watch iPhone videos pics etc through tv?

I have an iPhone and want to watch videos through my tv, can this be done with the universal dock or composite cable or do I need both?
I also have surround sound with iPod/iPhone dock which allows me to listen to my tunes but doesn't allow visuals, does anyone know how this can be achieved?
Many thanks

Apple Composite AV Cable

Apple Composite AV Cable

Product No Longer Available

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