where should i put the sum formula?

Hi all,
  I need help on how am i able to create a from that accept two input
in a textfield and sum the two inputs and then display the output in a
message box. I has write the code but i don't know where should i
write the sum formula, whether is it in the controller or in the
templates.
Some of my coding, i use from the remote form widget example. Here is
the links to my code.

http://paste.turbogears.org/paste/3079

i has try to put the sum formula in controller but there is errors
saying that num1 or num2 is not define.  Please help me out

Thank for teaching me.
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