How can I integrate templates?

[محروم.كوم]

Hello all!
I'm programming my forum templates and I added template witch called "forum_top_message".
Now* I want to integrate het with another template.
In regular programming of the default templates* the template can be added to another template by writing a var.

But* this is not a default template and I have to find a way to integrate this template with the HEADER template.
How can I do it?

Example:
[Header template* adding forumbits template]
HTML Code:

...
... $forumbits

And that what I want to do:
HTML Code:

...
... $forum_top_message

But instead of the var ($forum_top_message) I want the tempalte forum_top_message content.
How can I do it?

Sorry for my bad English... __DEFINE_LIKE_SHARE__