How set checkbox in Acrobat javascript?

how can i set value for checkbox in pdf form in Adobe Acrobat?

I have russian localization of Acrobat XI, and i figured out that this works:

this.getField("checkboxID").value = "Да".

(Word in quotation marks is Yes in russian language).

As i have googled people say i must put value "On".

but in russian locale it doen't accept On. If i try place anithing except russian word yes ("Да") it clears checkbox.

My customers can have russian and english localiztion of acrobat. So if i use russian word yes, it will work in russian version of adobe, but i suppose it will not work in english version. How can i set checkbot in any language?