HTML/Javascript calculator

We have a simple MS Excel worksheet that we need converted into a javascript calculator, suitable for a website. We will supply you with the worksheet which includes the formulas. There are 12 values that an end user can edit/update, and the form then calculates and automatically updates an end value based on a formula. The fields, when form initially loads, will each contain a 'default' value that is taken from variables in the JS code. The actual formula's are simple add/multiply/divide fields etc, and are all clearly visible in the Excel sheet we will provide. This should be a straight forward project any good javascript coder. You won't need to worry about CSS styling etc, just simple HTML form. To be delivered: > Clean, well-coded javascript calculator with all values stored in variables so that they can be easily updated at later stage > Should be delivered as a single .html page containing the form, with the javascript stored seperatly in .js file