java script

FYI:

you can do the same thing with triggers, using whatever action you are using to initiate the javascript.

Adjust variable Sum = 0 when user clicks button

Adjust variable Sum ADD Variable 1 when user clicks button

Adjust variable Sum ADD Variable 2 when user clicks button

Adjust variable Sum ADD Variable 3 when user clicks button, etc.

You just need a trigger for each step (6 triggers) that all fire from the same user action.

The advantage of using triggers is that it is easier for someone who doesn't write JS to do maintenance on the module. Also, triggers function in preview mode, while your module must be published for JS to function.