Module development and code questions

After a long search I finally got an example to show what I'm looking for :)

http://www.achieve360points.com/list/

My site (converting it to drupal) has an overview of cars, they are sortable in alphabetical order (like the example) and only the ones with the same first character are in the overview (so only all the cars starting with an "a" (or whatever option you choose).

is there any pre-built yellow pages module in drupal?

HI Guys,

I am using drpal drupal-5.1. I am creating a new module, that shows a form which require the new group and new account information.

Is it a good technique to call the user module functions to get the user online after submitting the new account information in this new module. OR
May I develop the new functions for this new modules.

One more thing how this function works.

Could any on give me an very simple example of how you would set an admin page to add a new enter into a mysql database using drupals for funtion. i have the page the text box
here is my code so far;

I need a clear guide to install Tinymce 2.1.1.1 on Drupal 5.2

I can't find an updated one: all for Drupal 5.1

I can't understand where the 'includes' directory should be (sites/all/modules/tinymce/includes ?) nor where the tinymce directory should be.

Please help.

How can I make file upload fields required?

In particular, the following option in the FlashVideo module doesn't work. I understand from the Lullabots that making file upload required is "broken," but there may be a workaround.

Selecting the following option in admin from FlashVideo does not prevent the submission of a node WITHOUT a video attached:

Require the FlashVideo for this node type.
(If checked, the video will be required to submit this node type.)