navigate into tags for dual screen

[W Wlourf]

Hi,


I'm new to this list and I use awesome with crunchbang since a few weeks.
I have a dual screen setup and I am looking for a way to view next or previous 
tag but for the TWO screens at the same time.

The original key-binding for one screen is :
awful.key({ alt,ctrl          }, "Right", awful.tag.viewnext )

I tried that for the two screen, but without success, nothing moves :( 
awful.key({ alt,ctrl          }, "Right", 
                                    function ()
                                        awful.tag.viewnext(1)
                                        awful.tag.viewnext(2)
                                    end),


thanks for any help