Scripting
Scripting can be client side, which means it is downloaded with the browser, such as the Javascript that runs this calculator below.
Or it can be Server side which means information is passed back to the server and calculated before returning to the clients computer.
There are many, many scripts that can be produced for just about any operation you could think of, it is therefore difficult to give a pricing structure as each script takes a different amount of time to build.
Some working CGI (Common Gatway Interface) scripts can be seen by clicking
the links in the Navigation bar on the Right.