Module development and code questions

I am developing a module (my first) for a corporate web site. The module's requirements:

1. Allow creation of events that occur at a specific date, time and place, and have a maximum number of attendees (i.e. a seminar).

2. Allow creation of reservation requests for a specific event. The reservation should contain contact information and the number of attendees.

3. Display events occurring in the next 2 weeks, including the number of available spaces.

I am looking for a way to set access/edit permission for singe albums in the image gallery module, (i.e. I create an album and want some roles to be able to only see it and other roles to be able to upload pictures etc., and then I create another album and want different permissions for that one)
but can't find a way to do this.
Any help on this?
And if it's not possible, is there another gallery module where this is possible?

Maybe I've missed a step on this one but here goes.

I have a Drupal installation that ultimately contains a Flash application. That Flash application needs to interface, to a small degree, with Drupal. So, instead of reinventing the wheel, I thought I'd piggyback off of Flash Remoting and XMLRPC. (This may be my fundamental flaw here.)

Is there a mailer that has any of the following functionality?:

- The ability to send email to all users based on user group.
- The ability to pre-populate the email with the referral URL (for example, if someone click on the Mail Function from page 1 of a book, it should be able to populate the email with the location of page 1 of the book)

If not, I would be willing to pay for a working module that can do these simple tasks.

I'm getting double slashes "//" in url. For example..... http://www.example.com//?q=node/1

At near the end of the url, there is a double slashes.

I have been customizing the code all last night and today encountered this. The problem is I cant remember exactly what I changed. i have been changing alot of codes, and removing some codes.

I checked function l() and function url() but those code was untouched

how to hide locked menu item in the navigation menu ??