Thanks for the replies.
What I\'m trying to do is to make a intranet site that holds different kinds of data (articles, calenders, contact lists, image galleries, etc) in different tables.
I have a crude system with main categories and sub categories. the reason I want to have unique id\'s is so I can mix entries from different tables in the sub categories.
Example: Category B, has a sub category K. Inside sub categroy K I want to place 3 articles, and 1 contact list. I want to be able to sort these by alphabet or date as if they were all entries from the same table.
I\'m not sure I understood what nabeel21 meant, but I\'ll look into it. I\'ll probably figure it out somehow, but I\'m not sure if It would be the best solution I want to give the users full ability to create categories, subcategories and put entries in these from the different tables I mentioned (articles, etc..).