Change username login to Email login - joomla

I use joomla's default login module. The module asks for username and password at the time of login. I want it to change it to Email and Password. Where do i change the code for it to happen. I use Joomla 1.5.21 . Any help is appreciated
Thanks and Regards
Sanjai

there is already a extension module for that purpose. I think it is much easier this way. You can find more info about it here:
http://extensions.joomla.org/extensions/access-a-security/authentication/10343
If you prefer to do it yourself, then you have to look into couple of different folders:
joomla_root/modules/login/
joomla_root/joomla/user/ (authentication.php)
In addition, you need to change all references to "username" to "e-mail", and to do that I suggest you make a change in the language localization file which can be found here:
joomla_root/language/en-GB/

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