JS Total Textbox In column & Keyup modifier

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Javascript

HTML

forms

Hey everyone, wanna thank you in advance for taking the time to even read this!

I have 2 troubles with my form so far, I have the navigation so that it is set up to be like excel, but I want to navigate to the textbox that's beneath when pressing enter, key 13 seems to do it, but when I do it, it's with the RIGHT-Enter key AND it goes down twice, not sure why at all, very puzzled.

The other trouble I'm having is finding out how to go about totalling the columns dynamically on the text-change event, everything I've tried so far is a failure, so I'm not quite sure what to do next or how to go about this. Below is my code so far, thank you in advance!

Since my code is so long, it can be found here:

http://shoutkey.com/inscrutable[^]