How can I get TV-out from this graphics card to an old TV

[volcs0]

I have one PC running XBMC that I want to out to an old CRT TV that only has composite video in.

This is the graphics card I have.

http://usa.asus.com/product.aspx?P_ID=sikN0jmrkCWmk1oD

As you can see, the output options are VGA, DVI-I and HDMI.

SInce DVI-I is apparently capable of both analog and digital, I took my DVI-to-S-video/composite cable I have (Apple) and tried it, but I just got a lot of flickering and shaking lines on my TV. I played with the settings (resolution and refresh rate) for a long time, to no avail.

I'm wondering if a VGA-to-composite adapter would work.

Or is there something I can do with the HDMI?

Thanks for the suggestions.