URLREAD Password Protected Website

Hi everyone. I am trying to use urlread to grab the contents of a password protected website. When I'm logged in, the url is http://media.nba.com/Stats/OfficialBoxScores.aspx, and when logged out, the url is http://media.nba.com/Stats/Login.aspx?ReturnUrl=%2fStats%2fOfficialBoxScores.aspx. I've tried

   urlread('http://media.nba.com/Stats/OfficialBoxScores.aspx' ...
        ,  'Username','username','Password','password');

with my login credentials but it only gives me the contents of the url before logging in. Is there a way to use urlread to get pass the password protection wall? Any help would be greatly appreciated!