We have 12 buttons on each bird  page, which open and close any year  from 2009 to 2014. I would be interested to introduce 2 additional buttons, which open and close all years. As an example please go to

https://docs.zoho.com/sheet/ropen.do?rid=hd3vbb834fba94b514ea7b2d048279dda68b2

I had a go, see lines 473 - 498 and 502 - 527 in the  editor, but it does not work. Can you let me know how to do it? I would be very grateful.

Kind regards

Hans