create a link to a website . .user name and password inbedded

build a link that i can post on craigslist and other places that takes people to the following [login to view URL] once there it asks for: Partner code and Agent code. Can you build a link that automatically fills in Partner code of "D" and agent code of "557" and then hits enter to take them to the next screen automatically? or do they have to? Please look at the website and let me know how you would best give me a link that could do this. THANKS! ASAP. I would think this is inexpensive just out of my league.