Are there any good tutorials on how to create your own registration, authentications using php/mysql/or javascript.
http://www.tutorialized.com/tutorials/PHP/User-Authentication/1
There you can find lots of tutorials regarding that topic. Hope it helps ;)
Edit: I agree with Aviad Ben Dov, OpenID is a much nicer solution than writing your own login system.
If it's not some exercise where you have to implement your own authentication sequence, I'd suggest using OpenID for doing the heavy weight-lifting. It's simple, a lot of sites use it, and you'll get rid of a lot of hassle thinking of security, encryption etc.
You can read about the Zend framework for OpenID here, and a tutorial on how to use it here.
Creating a Secure PHP Login Script (PHP/MySQL)
PHP Login script tutorial (PHP/MySQL)
PHP MySQL Login Script
PHP - Implementing Secure Login with PHP, JavaScript, and Sessions (without SSL)
These are only a couple of the vast resources available. Dig dig dig! :)
I found this post from another SO question. Pretty thorough and easy to follow.
http://net.tutsplus.com/tutorials/php/user-membership-with-php/