[DiapDealer]

Once you create and style your HTML TOC you just need to identify it as a TOC. If it has its own html file, just right click on the file in the Book Browser and select "Table of Contents" from the Add Semantics menu. That's the easiest method. That will make your GO TO TOC functionality work after you convert to MOBI.

If it's not in its very own html file... then you're going to have to manually add a reference to the guide section of the opf file that refers to an anchor in the html where your ToC starts.

Just pick a file in the epub and mark it as a TOC (even if it's not... you can unmark it later). You can then go to the opf file and see the general syntax for the TOC reference tag in the guide section.

EDIT: all the above is predicated on using kindlegen to convert the epub to MOBI. Calibre has a weird habit of homogenizing the inline TOC and the NCX file so they match (even when you tell it not to add the TOC).