More Form help needed =)

Good morning everyone, I have another form project, and yet another question. I need to generate script that when a number is entered in a field, that number is multiplied by a certain rate and generates a number in another filed. I also need the "total" fields to be added together to generate a total at the end. Here is an example
Thanks everyone!!

~Jo.

 

Javascript to the rescue!

add an onKeyPress event to the field. make it then run code to take the value of the text box, validate it, multiply it by a number, and then put that in another box...

 

Most appreciated, I will work with it. Thanks!