lol. . . that works! Didn't think about looking at the admin page. . . duh.
Here is a gadget version for people to download.
I made it slightly different--used Stano's older style by having the password field at the bottom of the content instead of in the admin menu--this way people can choose whichever way they like it. If someone wants this gadget version to work in the admin menu (but as a gadget and only on a layout) then they just need to swap the pphandle.php files.