FMP 6 and Web Companion

I'm using FMP 6 Unlimited running on Mac OS 10.2... we've been hosting pretty simple files directly from the FM 'Web' folder for years, and it has been working fine (creating new records, editing records, searching, etc.). We'd like to make some changes to the files, and use some newer functions (mainly html web functions) that we didn't need (or weren't available) years ago.

It appears that FM Web Companion can't handle some basic html commands. For example, I've tried to use an 'include' command for a header. Dreamweaver recognizes it fine, but the page won't load properly on-line. I've also tried some pretty simple html pop-up calendars that won't load properly.

So, my question is: Is this a FM web companion issue? If so, do I need to upgrade to different hosting software (like Apache) if I'm wanting to use some different html commands? If that's the case, can someone recommend some pretty basic web sites that can walk me through this??

If anyone has any other recommendations, I'd love to hear them!!

Thanks!!