calculation sum

I need a excel spreadsheet to be created that can be a simple sum calculator. I want it to be converted or built in a separate 1 webpage that I can link to my website. It only needs to show the product description in about 7 words. Then when the customer clicks on the item either to add or delete it will show the total cost amount. Thats it! Nothing else is needed! Will probably be about 15- 20 rows. each row has a drop down menu with 2-5 selections in it. A box for quantity ordered. then the total box in each row and a total amount at the bottom. I have an example in worddoc that you can see what I am looking for.