I don't want zoho form redirect

I don't want zoho form redirect

Hello!
I'm new in zoho forum. My problem is this: I have a form zoho integrated in my website in a page that is processing data from another form and take the variables in the zoho form.

  2. <form action='https://crm.zoho.com/crm/WebToLeadForm' name=CANCELEDINTHEPOST method='POST' onSubmit='javascript:document.charset="UTF-8"; return checkMandatery()' accept-charset='UTF-8' id="formid">
  3. <!-- campos editaveis -->
  4. <input type="hidden" name="First Name" value="<?php echo $first_name?>" />
  5. <input type="hidden" name="Last Name" value="<?php echo $last_name?>" />
  6. <input type="hidden" name="Phone" value="<?php echo $phone?>" />
  7. <input type="hidden" name="Email" value="<?php echo $email?>" />
  8. <input type="hidden" name="Mobile" value="<?php echo $cel?>"></input>
  9. <input type="hidden" name="Company" value="<?php echo $company?>" />
  10. <input type='hidden' name=CANCELEDINTHEPOST'  value="<?php echo $oper_p?>" />
  11. <input type='hidden' name='Zip Code' value="<?php echo $cep?>" />
  12. <input type='hidden' name='Street' value="<?php echo $endereco?>" />
  13. <input type='hidden' name='City' value="<?php echo $cidade?>" />
  14. <input type='hidden' name='State' value="<?php echo $estado?>" /> 

  17. <!-- campos hidden  -->
  18. <input type='hidden' name='xnQsjsdp' value=CANCELEDINTHEPOST />
  19. <input type='hidden' name='xmIwtLD' value=CANCELEDINTHEPOST />
  20. <input type='hidden' name='actionType' value=TGVhZHM= />
  21. <input name="Lead Source" value="Site DeskManager" type="hidden">
  22. </form>
This form redirect in the site home page, but I want that stop in that page included in the processing file "plano_assinado.php":

  2. if ($enviado) {
  3. $msg ="A mensagem foi enviada com sucesso!";
  4. $tr ='N';
  5. include 'plano_assinado.php';

 How can I desable zoho auto redirect?