Don't hold your breath for an answer....

You haven't told us about the web site.

We don't know if you're having to deal with a username and password on
a form and then a submit - or whether you need to provide username/
password information into an Apache .htaccess popup. Or whether, like
Spiggy is thinking, you want to pass along your NT credentials.

You need to provide more information about what you seen on when you
log in or your just wasting people's time.

Aside from that - your not knowing about different kinds of log ins -
and your preoccupation with using WebQuery - it kind of suggests that
if someone provided a solution to you - you don't have the technical
chops to take a tip and translate it into a solution.

It's amazing that you even have a job.