Script To Check Both Fields In Form Before Submitting?

Nov 10, 2009

I have this Form, where there is a field that requires a number to be entered into it. How can I add the function where the number has to be re-entered into the next field, and match the original number field? I want to check that the number in both inputs is the same before the form will be submitted successfully.

Code:
<html>
<head>
<title></title>
</head>
<body>
<br>
<h1 style="border-bottom:1px solid #dddcdc;"><br><center> Form</center></h1>
<p><center><font face="verdana"><font size="2"><font color=#000000;"></font></font></p>
<p><font face="verdana"><font size="2"><font color=#800000;">Please complete the simple form below.</font></font></p>
<p><font face="verdana"><font size="2"><font color=#000000;">.</font></font></p>
<p><font face="verdana"><font size="2"><font color=#000000;"> </font></font></center></p> .....

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