MOSS 2007 – site authentication…

Hi

I am using MOSS 2007 installed on W2k3 ENT with SP1 with SQL 2000. Every thing works fine, but on client side whenever we try to open any web site, it prompts for user name & password, it did not take logged in user credentials. I have enabled Integrated windows authentication in IIS & NTLM authentication on web applications.

Strenge thing is that whenever I opened the sharepoint website in New Tab in IE 7, it takes logged in user’s crendentials, but if I opened a new IE window it prompts for user name & password.

Any help will be appriciated..