Problem in yahoo mail opening?

[Kailash]

i am having another yahoo id. when i go to the sit mail.yahoo.com, it asks for user id and password. when i enter it and click sign in, it is again and again asking for user name and password. I have entered the user name and password correctly.I also tried entering a different password, it shows wrong password.But when i enter the correct details it doesn't work.Kindly help me with this bcoz i need to read an important mail