I need to create a price calculator for virtuemart. it must
1. Be controlled from the admin panel
2. Ability to set up different calculator's for different products
3. Allow up to 7 fields to be calculated
4. Have an add to cart button which will insert the calculated amount into the price field
5. Layout done in CSS
6. Installation instructions in ENGLISH.
I have a Joomla/virtuemart site that can be used for testing.
You can see an example of what I am looking for here
[url removed, login to view]