[Javascript] Updating a text box - calculations

[Tim Burgan]

Hello,


In a form, I have 5 text boxes vertically on top of each other. Each 
where the user can enter a dollar amount.

Then in a 6th text box.. it displays 2% of the sum of the 5 text boxes.

Then a 7th text box adds the values of all 6 text boxes to give a grand 
total.


How in the world do I do this with Javascript?

Are there any resources available anywhere that describe how to do 
something like this?


Thanks

Tim