Web Page Calculations - Poss Javascript?

I create simple applications using web based programming. I have a simple profit & loss table that I would like to have setup to perform 3 calculations based on user data inputs . See attachment for details

(1) Calculate {@GrossProfVal@} which is {@SalesVal@} - {@CostProfVal@}

(2) Calculate {@ExpVal@} which is sum of all Expense inputs

(3) Calculate {@ProfitVal@} which is {@GrossProfVal@} - {@ExpVal@}

All other values enclosed by "{@ @}" are user inputs (this is the convention used by the creation software I am using).

This needs to be client-side scripting - possibly javascript?

Would prefer the calculations to be performed "on-the-fly" if possible - if some sort of button is unavoidable this needs to be set up as non-printing object on page.

Will end bidding early for right bid - escrow only for those new to GetAFreelancer.

I can pay immediately upon completion through GetAFreelancer. Those wanting PayPal directly may have to wait a few days while I deposit funds into my account.

Will end bidding early for right bidder.

JavaScript

Projektin tunnus: #6652

Tietoa projektista