I need some simple Javascript. Basically I want to make a simple
calculation based  on several numbers that the user inputs.

The form is here: http://www.bikiniguru.com/payment.html

There are 4 variables the user can input (under billing and payment)
bikini_price
one_piece_price
shipping
deposit

A number should appear in the 'total' field equaling:
bikini_price + one_piece_price + shipping - deposit

This should be calculated on the fly like on this page:
http://www.mcfedries.com/JavaScript/OrderTotals.asp

I don't think this should be too difficult but if it is let me know
and I will up the price.

Thanks,
-John