HTTP Authentication on IIS

Hello, After scouring the internet in search of a GOOD HTTP Authentication script. I found basically what I was looking for. Granted I'm new to php, the script found at webmonkey.com proved perfect. Well...it works...for them. I need it to work on an IIS server. What do I need to do? script: http://hotwired.lycos.com/webmonkey/00/05/index2a_page2.html?tw=programming Once I get that working, I have but one other unanswered question. How do I pass along the AUTH_USER and AUTH_PW along to the script from a form? Would I just use a form tag? (I know html) Thank for any and all help. Quickly! ;P lates, click46