Use JavaScript to check the password input
<html> <head> <title>A Simple Page</title> <script language="JavaScript"> function sendMe() { return confirm("Continue?"); } function chkForm() { if (form1.pass1.value != form1.pass2.value) { alert("Password does not match"); form1.pass1.value = ""; form1.pass2.value = ""; form1.pass1.focus(); return false; } } </script> </head> <body> <form name="form1" method="POST" action="someCGI.cgi" onSubmit="return sendMe()"> <p>Enter you password: <input type="password" name="pass1"><br> Re-enter you password: <input type="password" name="pass2"><br> <input type="submit" value="Submit" onClick="return chkForm()"> <input type="reset" value="Reset"></p> </form> </body> </html>