Help - RunTime Computation

Hi,
I got 2 field (FIELD1, FIELD2) on the same form. I want that every time I enter number value on FIELD1 it would add (total) on whatever value that FIELD2 have (runtime if possible).
The FIELD1 is an item (not reference to any table column) and FIELD2 is database column and want the database column to be updated everytime I make a save.
Appreciate any help on this.
Thanks,

What's wrong with td.setVisible( false );?

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