Thank you for answering so fast!:-)
But i'm still having problems...When you say all 3 files which files do you mean..?
I have done exactly what your instructions say..
On oscommerce,under modules, says Module Directory: C:/Apache2.2/htdocs/catalog/includes/modules/header_tags/
Have I to copy smth into this directory? perhaps the ht_theme_switcher.php ? I have the 1.8.7 version...
I can't understand why it doesn't work to me only!Please show understanding to a person who is completely irrelevant with these subjects!