OSCOmmerce - convert to UTF-8

[login to view URL] is OSCommerce with additional language - Korean. In the near future we want to also add Chinese. But we have had some problems because the template is not all UTF-8 - some latin1 charsets for example don't display Korean double-byte characters. I want to tidy this up before we do the Chinese langugae (so whoever does this will probably get that project as well) - so I want everything in the website to use only UTF-8. So the project should be simple - make sure all pages and code uses UTF-8.