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Is it possible to use other instance login info in VF page ajax connection?

Hi All,


I need to make some ajax code in a visual force page, that user can input username, password and security token to login and made some query in the instance.


My ajax code is like below:
        var result = sforce.connection.login(strUserName, strPassword + strSecurityToken);


I can login successfully with the login info in current instance, but failed with other instantce login info.


Is it possible to login with other instance login info?