SCART to S-VHS 2 x Phono Plugs
http://www.maplin.co.uk/Module.aspx?ModuleNo=13398
SCART to 3 Phono Plugs with In/Out Switch
http://www.maplin.co.uk/Module.aspx?ModuleNo=28102
SCART is really just a connector containing (potentially) several different video outputs and stereo audio. Chances are your video will output s-video through the SCART connector, so just use that.
For more information about SCART than you really need, look at Wikipedia:
http://en.wikipedia.org/wiki/Scart 