set read_glass_dock to "defaults read com.apple.dock no-glass"
set set_glass_dock to "defaults write com.apple.dock no-glass -boolean "
set kill_dock to "killall Dock"

set is_leopard to my check_for_leopard()
set no_glass to false
try
	-- error silently
	if (do shell script read_glass_dock) > 0 then set no_glass to true
end try
if no_glass then
	set toggle_no_glass_value to "NO"
else
	set toggle_no_glass_value to "YES"
end if
try
	-- error silently
	do shell script (set_glass_dock & toggle_no_glass_value)
	
	do shell script kill_dock
end try

on check_for_leopard()
	set the hexData to system attribute "sysv"
	set hexString to {}
	repeat 4 times
		set hexString to ((hexData mod 16) as string) & hexString
		set hexData to hexData div 16
	end repeat
	set the OS_version to the hexString as string
	if OS_version is less than "1050" then
		error "This script only works under Leopard."
	end if
	return true
end check_for_leopard