Question for system condition

Hi,

Is anyone have an idea to use condition for a selected skin in settings ? Possible ?

I need a condition when this skin is selected, for this setting (in guisettings.xml) : <setting id="lookandfeel.skin">skin.estuary.modv2</setting>

For a specified language I use : String.Contains(System.Language,French) but for skin I have no idea.

Thanks.