I was able to solve the eroor I was getting: all this was because I use ?Login instead of ?login! I sometimes forget that X-cart is case sensitive.
Now, a question: How would I display "user logged in !" message, along with the Logoff buttom, one a customer is logged in? Where do you recommend displaying this message? Ussually, it can be found right inside the menu we are trying to eliminate.
Regards,
Lorena