Toggle Play Pause in Google Chrome using AppleScript

toggle.scpt

if application "Google Chrome" is running then
	tell application "Google Chrome"
		activate
		repeat with w in (windows)
			set j to 0
			repeat with t in (tabs of w)
				set j to j + 1
				tell t
					if URL starts with "http://www.youtube.com/watch" or URL starts with "https://www.youtube.com/watch" then
						set (active tab index of w) to j
						set index of w to 1
						tell application "System Events" to tell process "Google Chrome"
							-- toggle play/pause
							keystroke "k"
							-- cmd+tab back to previous application
							keystroke tab using {command down}
							
						end tell
					end if
				end tell
			end repeat
		end repeat
	end tell
end if