Audio and video cable not working?

I just got this audio & video cable made by iwave (model IA7505) and it doesn't work. One end plugs into the iPods headphone jack and the other into av jacks in your television. I went online to see if I could diagnose the problem but it didn't help much iwave's website said its plug and play but it isn't working. Anybody have any ideas about what I may be doing wrong? Do I have to change settings on my iPod? (my iPod is a 4th gen iPod touch if it matters at all)