If your card has an s-video/composite out then use something like this type of adapter :- http://rswww.com/cgi-bin/bv/rswww/searchBrowseAction.do?Nr=avl%3auk&N=4294739447&name=SiteStandard&forwardingPage=line&R=3034078&callingPage=/jsp/browse/browse.jsp&BV_SessionID=@@@@0960701476.1159441055@@@@&BV_EngineID=ccciaddimgmhhmgcefeceefdffhdfgi.0&cacheID=ukie
For what you want to do that's the kiddie but you can get gold plated ones for about £12-£15 if you have too much cash :lol:
when you use the AV input channels (not the normal 1,2,3 etc. but the other ones) they may have symbology like a rectangle with rgb or --- inside it meaning RGB I think, or a rectangle with s inside it, meaning (you guessed it) S-vhs or S-video. They will also all support composite. One my sony each scart input corresponds to two AV inputs, one composite and one RGb or S depending on which socket.
You may also find the that the sockets have little indented symbols next to them (if you are lucky)