ASP form

I have a form with three fields (2 pulldowns, and 1 checkboxes) if a certain criteria is met
I would like to introduce another field. Do I do this at the submit?

ie. If Field A = 123 and Field B = XYZ then post to newpage.asp


post to emailformpage.asp
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Like this: (use a JS function that will change the action of your form in a certain condition upon submit)

<form action=emailformpage.asp onsubmit="return checkValues(this)">
<input type=text name=fieldA>
<input type=text name=fieldB>
<input type=submit>

function checkValues(frm)
if ((frm.elements["fieldA"].value=="123")&&(frm.elements["fieldB"].value=="XYZ")) frm.action="newpage.asp";
return true;

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