creating new folders with a letter and numbers

I am trying to create a script that creates a series of folders with a letter, in this case a "M" followed by a number. For example:

M10
M11
M12
M13
and so on...

This is what I have so far:

tell application "Finder"
repeat with i from 1 to number of items in application "Finder"
set this_item to item i of application "Finder"
make new folder at folder "M10..." of folder "M1..." of folder "NEW ITEMS 2008" of folder "MacUsers" of disk "MACART$" with properties {name:}
end repeat
end tell

My question is how do I add numbers to the property name that has a letter in it?

Thanks in advance for the help.

Hello,
I have three scripts for you that might come in handy.
The first script creates a folder.
The second script will create four separate folders, M10-M13 on your desktop.
The third script will create the M10 folder with the folders M11-M13, inside of it on your desktop.