[shemi]

hi to all.
i am trying to do form validation through javascript and captcha using php.
when i try to alert for invalid security code, if thecode is correct also, it is giving alert boxes of invalid code and when i click ok button, page is redirecting to the next page.

my form code is
<input type="submit" name="submit" value="submit" onclick="chk();">


chk is a javascript function

PHP Code:

function chk()
  {
  alert("<?php chk1(); ?>");
 
   }
it is calling a function named chk1. it is php function
<?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";

         
   } }  
?>