Module development and code questions

Currently I am working on my single website(single domain+single databse). Now I want to share single database to multiple domain.System is linuxbase and mySQL database.I dont have any idea about that.Plese anyone can help me???????

regard,
Bhavna

1) I configured the profile module in admn\conf\module\profile. I selected all options on the profile module page. I have also selected the option "Avatar or Picture" and saved the configuration and logged out as an administrator.
However, when I clicked on a new User link. It is showing only UserName & EmailID & not all the fields i had enabled and saved as an administrator before.

I am trying to add administrator view and edit tabs to the CVS version of the project module.

I've been through the new menu docs and have looked at other modules that implement LOCAL tabs, but I can't get them to appear.

I bet it's real easy, too.

I've added the Image and Filestore modules to my drupal site and have activated the modules. After a bit of work on directories, they work.

i am using drupal 4.4.0 and associated modules with same version.
Iam not able to save images in the database , I get an error like

"warning: Rename failed (No such file or directory) in /home/sites/site1/web/drupal/modules/image.module on line 719.
Cannot save image."
There's no problem with the premissions of the directories

When I try to preview an image that I'm uploading on a new drupal site with the just installed "image" module, I'm getting the following error message. Does anyone know what might cause this?

warning: move_uploaded_file(./tmpimg_dharma-posse.jpg): failed to open stream: Permission denied in /usr/www/users/mimir/ngakpa/modules/image/image.module on line 463.

warning: move_uploaded_file(): Unable to move '/usr/tmp/phpOUeGsv' to './tmpimg_dharma-posse.jpg' in /usr/www/users/mimir/ngakpa/modules/image/image.module on line 463.