I am trying to do form validation through javascript and captcha using php.
when i try to alert for ivalid security code, i cant see the alert box. if icode is correct, page is redirecting to the next page.
what should i do to give alert box for invalid security code??
my form code is Code:<input type="submit" name="submit" value="submit" onclick="chk();">


chk is a javascript function
Code: function chk()
{
alert("<?php chk1(); ?>");

}


it is calling a function named chk1. it is php function Code: <?php
function chk1()
{

if( $_SESSION['security_code'] == $_POST['security_code'] )
{

echo 'Thank you.code is valid';

header("Location: process.php");

} else {
print "enter correct security code";

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