I don't know if you tried to embed the video to the html-site, since it's not supported in the 3660. You can put a link pointing to the videoclip to the html-site. And then you have to have the correct MIME type specified on your serverside. For 3gp-video it's video/3gpp.
I haven't used Quiqtime for creating 3gp-files, so I don't know much about it. We have also Nokia Multimedia Converter 2.0 availabe, which can also be used to create 3gp-files.
Video and Streaming Content Creation Guide can be downloaded from here.