tell application "Finder"
	activate
	display dialog "Change your startup disk to:" buttons {"Mac OS X", "Mac OS 9.1", "Mac OS 9.2.2"} default button "Mac OS 9.1"
	set the user_choice to the button returned of the result
	if the user_choice is "Mac OS X" then
		do shell script "/usr/sbin/bless -folder '/System/Library/CoreServices' -setOF" password "YourAdminPW" with administrator privileges
	else if the user_choice is "Mac OS 9.1" then
		do shell script "/usr/sbin/bless -folder9 '/Volumes/Mac OS 9/System Folder' -setOF" password "YourAdminPW" with administrator privileges
	else if the user_choice is "Mac OS 9.2.2" then
		do shell script "/usr/sbin/bless -folder9 '/System Folder' -setOF" password "YourAdminPW" with administrator privileges
	end if
end tell

Here is what I wanna do:

ell application "Finder"

activate

do shell script "/usr/sbin/bless -folder9 '/Volumes/Mac OS 9/System Folder' -setOF" password "xxx" with administrator privileges

restart

end tell

But when I try the script, it won't quit and the logout is timed out because of that.

Can somebody please tell me what's wrong?