toolbar icon pointers?


Is there a way to make the toolbar icons point to a location outside of your home directory? In particular here is what I'd like to do:

Hard drive 1: OS X.1 system
Hard drive 2: All my applications
Hard drive 3: All my music

With this settup, when I boot off of Hard drive 1 is there a way that I can have my toolbar's applications icon point to the folder in Hard drive 2, and my toolbar's music icon point to the folder in Hard drive 3?

I know this is probably really simple, but I haven't been able to figure it out. Thanks in advance for your help.
no problem:
open up a finder window and drag whichever icons you want to the toolbar ... :)