> How can I load offline  sites  with password&I.D.

If the website is authenticated using standard HTTP 
authentication (that is, not through a "login" page, 
but through a regular authentication alert box), use 
the form:
youruserid:yourpassword@www.foo.com

Such as:
smith:foobar@www.mywebsite.com/protectedarea/

For other authentication systems (such as form-based 
authentication, which is more difficult to handle), 
search for the various threads in this forum (you can 
try "authentication" in the search box)