choose multiple folders with choose menu and empty their contents

Hello all,

new to applescript and want to create a choose file menu where I can choose more than one folder and purge their contents. There would be a dialog box at the end letting me know that the folders have been purged. The script I have works for an individual folder:

tell application "Finder"

close every window

open (choose folder with prompt "which folder(s) should i purge?" multiple selections allowed "True" default location "/users/bryceratops/")

set a to front Finder window

move every item of a to trash

close front Finder window

end tell

tell application "Finder"

display dialog "folder(s) purged." buttons {"ok"}

end tell

But Im having a hard time setting up this script to open, purge, & close every finder window If I've selected multiple folders in the choose menu.

Any ideas?

Cheers