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Welcome to WebmasterWorld.
I learned my Chinese through a local college one night a week, and by living in China. I am not aware of any resources where you could learn over the net and I imagine it could be difficult simply because the languages are so different from English (which I am assuming is your first language).
You could try the local languages store for some language tapes. they do help. Or become involved in the local Chinese/Japanese communities and learn that way. You may even find some schools or privat tutors there as well.
Onya
Woz
I learned my Japanese before the web was popular, so I can't recommend any sites for a beginner. You really need to put a lot of emphasis on pronunciation so that you have a chance of being understood by a native speaker, so I'd take Woz's suggestion and get a book with some tapes. Then you might want to find a native speaker and buy them dinner or drinks fairly often so that you can practice. ;)
One of the better collections of links concerning the Japanese language is run by a professor at Monash University in Australia named Jim Breen [csse.monash.edu.au].
About.com's Chinese section may also have some information.
A long time ago I learned a little Chinese from a web site, but after a while I realized that the amount of stuff you need to know is really hard to put on one web site. An alternative is to buy books with audio tapes to go with them. The site:
[chinabooks.com...] has many language instruction books you can buy, newspapers, magazines in Chinese, etc. - they even have the Harry Potter books in Chinese!
(According to the charter for this forum it should be ok to include the urls above, but if they get cut, sticky me and I'll send them to you.)