[AccessD] OT: Putting a Password and Logon name to an HTTP address

Hi Guys
Way OT, but I wanna code it into an app.
On some WebPages we are forced to logon to a web site using
the standard Web version of a logon box comes up asking for the
User Name and password for that site. (These are NOT sites I or we have
designed)

It's the generic one
See a screen dump at 
http://tripledee.com.au/accessd/Generic_Logon.jpg

Anyway...my question is this
I can pass credentials to an ftp session by doing something like this

ftp://UserName:Password@someServer.com.au

Cool

When I try the same syntax using
http://UserName:Password@someServer.com.au
In an attempt to bypass the screen in the screen dump it fails.

Does anyone know a way to do it?

Many thanks

Darren