[CS5] - script : select group to change layers' font

Hi,

I want to create a script as I can duplicate all the layers of a group and then change their font. I wanted to create a script because, depending on my file, there won't be the same number of layers in a group.

I can select layers to move them but I don't succeed in layers selection for using text tool, need help please !!

Thanks in advance

(Using CS5 portable)