Hello, its easy job to do. I propose to write easy js function witch will react on change of your checkbox changes. It will work fine in all main browsers. I made a lot of scripts like this so it will be fast work for me. After i will get full instructions, witch field have how many points, and data to hosting i will start job and finish it in couple hours. I will do the job in this way, that You will can change summary number from 5000 to for example 250 or 10 000 in easy way, by changing 1 variable :)
Can we start tommorow?