How do I connect my iPhone to my home theater system???

Buy this:

http://store.apple.com/us/product/MB129LL/B?mco=MTY3ODQ5OTY

Or this:

http://store.apple.com/us/product/MB128LL/B?fnode=MTY1NDAzOQ&mco=MTA4NDc4Njc

Beware of some aftermarket units, as they lack the chip your phone looks for & thus will not work.

Wjosten, wondering if I am victim of aftermarket. I purchased similar product as your first link from my ATT store, where I purchased my iPhone. When I plugged the RCA jacks into my TV, I noticed the following. I could only play videos, such as ones that I created on the iPhone. I could not show onto my TV any pictures nor play sound from my iPod feature. When I plugged my R and W RCA jacks into my stereo system, I was able to play my iPod. Is this normal?

You should be able to view photos as a slide show with music using the ipod function with no problems using the Apple cables. As I mentioned, the iphone looks for a chip in the cables and if not present, well things won't work.