ACL with password over ride?

Question

I'm using ACL to a Folder I call Master Images, it is set up to allow anyone to add images and open the images, but they are prevented from deleting them. But there are occations when users do need to be able to alter these images. My intial soloution was to set up a user that did have permission to delete, this works but in practice no one uses it cos it interrupts their work to log out and in the out and back in.
Ideally I'd like a window to pop up and let the user enter a password to authorize the delete, but with ACL all the user see is a message saying you don;t have permissions, any other ways round this. it is important the files are not easy to accidently delete.
Maybe its possible to write a applescript that would take on extra permissions to delete a file?

Answer 1

I slightly modified the script because although it worked it gave an error message when used on a network home, so I changed it to:
set the_path to "Volumes/RAID/test/Master Images/"
set the_string to POSIX file the_path as alias
tell application "Finder"
set the_names to (name of items of folder the_string)
end tell
set the_item to item 1 of (choose from list the_names)
set the_path to "'" & the_path & the_item & "'"
do shell script "rm " & the_path with administrator privileges
I'd like to be able to just save the App in a folder and have it automatically recongnise the folder it is in, rather than having to change the first line to the path of the folder manually, any pointers?