Pebbulz

Hello, I can't log in to the launcher. I am using the jar, and the login button,options button, and mod select button is greyed out. I do have the real minecraft, not some rip off version downloaded online. I see no reason why this wouldn't work, because obviously no one else is having these problems. Also, I am using minecraft 1.2.5. If I should be using a different version, please tell me. Help!