How to load a different header without changing the page?

One for coding wizards out there. Hope you can help — will link to your site in our footer if you can. My site is http://www.SKRBBLR.com

My site features a music player (of sorts) in our header. This loads on every page, but I want to make a clickable link saying ‘Hide’ that would hide it, and another link when it’s hidden saying ‘Show’ to show it. I would imagine the easiest way to do this would be to load a different header on demand that lacks the music player code.

I’m aware you can have different headers for different pages, but that doesn’t solve the issue as the player will re-appear on certain pages. I need some sort of code to load an alternative header without changing the actual page that the user is on. I have absolutely no idea how to do this, or even if it’s possible.

Alternatively, a ‘tabbed slider’ that comes from the top of the side with a hide button would do the trick. I can’t seem to find an appropriate one of them either.

Any help appreciated.