To obtain the tutorial, click on the link. However, these tutorials are open source, so that the user can download the source and the accompanying graphics, edit them and use them. If the user makes significant changes, that user is encourage to mail them back to firstname.lastname@example.org , and the improved version will be reposted here for everyone. However, please keep the credits for the original authors. Users may also email me their tutorials to be added to this page as well.