Breadcrumb trouble when forum is not in root dir

[Antivirus]

My forums are located here: www.eclipserecords.com/forum/index.php

My homepage is a custom vbulletin page located here: www.eclipserecords.com/index.php


My problem is as follows:
When viewing UserCP (or any other vbulletin page within the forums), the breadcrumb looks as follows:
Homepage > User Control Panel

When viewing forumhome, the breadcrumb looks as follows:
Homepage

What I want is for (within every forum page) there to be a Forum Home within the breadcrumb. For instance, when viewing UserCP, like this:

Homepage > Forumhome > User Control Panel


Now, my entire site uses the navbar template for all pages, even all the custom scripts and pages in the root directory, so what I need is some way to display a link within the breadcrumb to the Forum main index page, but only when viewing pages within the forums.


How would I go about doing that?