Just some little additions:
- In order to have the system boot into WinDoze, you'll have to put that entry first (or define it as default [#] ("#" being the number of the WinDoze menu entry).
- Set hiddenmenu 1. Look for more information on how to format the entries here: http://www.gnu.org/software/grub/manual/grub.html
- To be able to hit a key (in terms of: have enough time) I'd use timeout 2 - "0" being a bit on the fast side of doable

- Oh, and it's "title" - I don't want to appear narrow-minded or anything, but in this case, precision helps...
Edit:
Okay, I'll try to reiterate:
You'll have to edit the file
/boot/grub/menu.lst as root or, in the case of
Mint, using "sudo". Open a terminal and type
Code:
$ sudo gedit /boot/grub/menu.lst
After entering your password, an editor will open the file in question. The menu items are on the bottom (you'll see a busload of automatically generated and default stuff). But first, look for "timeout" first and set it do something small, but not "0" (you want to be able to press a button, don't you?). Then look for "hiddenmenu". It'll be (most probably) commented out with a "#" in front of the line in question. Remove the "#" and add a "1". If it isn't there at all, just add a line "hiddenmenu 1" to the file before the actual menu items.
Then either change the order of the menu items so that the whole entry for WinDoze comes before the one(s) for
Mint or add a suitable menu entry for WinDoze (for all I know, there's already one there, you'll only have to move it).
I hope that's better...
M.