Mozilla Bookmark Import Help

Does anyone know of a way to import bookmarks from Opera 7 into Mozilla 1.4.
This is on the Windows 2000/XP platform.

I've tried exporting the bookmarks from within Opera in both Opera's format and HTML format, but neither will import
properly into Mozilla. At best the import function within Mozilla will only import a small fraction of the Opera
exported bookmarks (I have a couple hundred bookmarks).

I manually opened Opera's export file to ensure all the bookmarks are, in fact, in the export file.

Has anyone had any success importing Opera bookmarks. Is there a conversion utility available?

Any help would be appreciated.
Thanks,
Peter