>> where i have different css filename for example 'ws1.css' and 'ws2.css', but i some cases the css class name are the same in that files but different properties for example:
this is the key.
a) make them the _same_ name - use the folder location to differentiate them rather than the name.
b) On the WebServer procedure, nettalk extension, Settings, styles, Files, add the "one name" there.
cheers
Bruce