Add an option box with price to PHP catalog script

Add a drop down options box with price to my PHP catalog script, to enable a customer to choose an extra option, then have the option text sent to the cart and the option extra cost added to the standard price and then sent to my shopping cart, also change the admin page to allow me to add the options box with text to some items in my catalog. The drop down options box with price would only be on some items in the mySQL database ( I would not want the empty drop down box to show on all records), and would prefer all the code to be in .inc files So if I was selling a part with the choice of two options, partA would cost £50, while option ‘partB' would cost £60, option ‘partC' would cost £75 So, I would have partA set-up as normal, showing the £50 price etc, as it is now, then a drop down options box showing ‘short text' and extra price - ‘partB' + £10 ‘partC' + £25 Then have it all linked to the BUY NOW button to post to the cart- Part number (as it does now) Quantity (as it does now) Description (as it does now) Plus the ‘short text' from the drop down box Price either £50 (as it does now) or the option would add £10 or £25 to that total A good example of the options box with price [login to view URL] An example of where I would want he option box [login to view URL] ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Full instructions on how to install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. ## Platform code in PHP 4 with a MySQL database