Simple JavaScript Power Calculator Required

I require a simple JavaScript / HTML power calculator for inclusion into a web site. Please see the attached .PDF file for additional detail... The section I require coding is highlighted in yellow. The section highlighted in dark yellow represent 'input' (form) fields. When the JavaScript calculator loads, the user will enter the number of electrical appliances in the 'QTY' column. Each time a 'QTY' input field is modified, the relevant 'TOTAL WATTS' field is updated. I.e. 2 x Cash Tills = 200 Watts. In addition to the relevant 'TOTAL WATTS' field for each item updating, the 'TOTAL WATTS' field at the bottom of the form will also update, containing the overall total. The code needs to be flexible enough to allow for future adding of additional electrical appliances and for the modification of the 'TYPICAL WATTS' value. This calculator needs to function on the main common browsers - IE, FireFox, Safari, Opera, Netscape. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform IE 3.0+, Netscape, FireFox, Opera & Safari.