addition of two form fields

i have 2 form fields getting record data base, both numbers, , in same form, add third field, , value putting 2 other fields together,

 

here want:

 

i have:

 

x = field 1 (get value database, number)

 

y = field 2 (get value database, number)

 

i have final result:

 

z (form field three) = x + y

 

 

java or whatever else work, (i using dreamweaver cs5)

 

thanks

please explain how 2 fields (x, y) getting values. populating list box user selects value from, or single value recordset? if latter, can add calculated field recordset:

 

select x, yb, x + y total mytable

 

if former, need tell how sum used.

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