please i have this calculating form but not working, help me.
Dear sir,
Help correct this calculating form for me.
Here is the code.
<html>
<head>
<title></title>
<script type="text/javascript">
function calculate(){
A=document.frmone.txtfirstnumber.value
B=document.frmone.txtsecondnumber.value
A=Number(A)
B=Number(B)
C=A B
document.frmone.txtthirdnumber.value=C
if (Number(A)
