Question : exchange homepage, IIS6, OWA

I have a Windows server 2003, with Exchange 2003 and IIS6...
When I go to my OWA webpage https://mycompany.com/exchange  I don´t see the webpage where I can type my user and password instead I get a popup where I type in the user and password....  What do I need to do to get the initinial Outlook Web Access home page instead of a popup? Did I explained myself?

Thank you all..

Answer : exchange homepage, IIS6, OWA

For domain try your NetBIOS Domain Name not the Internal DNS name (IE: DOMAIN\user)