Getting your gmail on

Is there any way to specify your default email app as a website in a Windows XP system? Currently, my office workstation has an ancient copy of Eudora I haven't used in years, but whenever I need to email someone from my PC (I do all my email on a powerbook), I have to copy/paste addresses by hand and use my mac or use Gmail.

It seems like there should be a way to tell firefox my default email app isn't an app, but is instead gmail.google.com.

update: a bunch of people sent me some registry hacks to make this happen. Seems that all you need to change is this key:

[HKEY_CLASSES_ROOTmailtoshellopencommand]

Add the path to firefox and the URL to gmail, and it should work (I'll try it out in the morning)