Sounds like you need to keep the data in these separate databases in sync? That is possible but it would be a nightmare and I am not the person to...

Check out the Microsoft Patterns and Practices Enterprise Library.

http://msdn2.microsoft.com/en-us/library/aa480453.aspx

The Data Access Application Block is what you want to look at.

I used it once in an earlier version...

I am using Visual Studio. You can get the Express Editions for free in either VB.Net or C#. http://www.microsoft.com/express/download/

It is easier to use VB.Net than javascript, especially since...

I attached it as an example, you must save it to your pc and open it with notepad or a text editor. If you just open it, it will try...

Attached is a very simple web form that will do what you want. For simplicity, I have not sanitized the data the user may type in. You should validate for...

This would be simple enough to do, but can be implemented many ways. What is your server side technology? ASP.Net, PHP, etc?