paypal related issues

[eluser]dhananjay[/eluser]
i m using this library for PayPal standard

http://www.amplio.ch/blog/web-developmen...deigniter/

there are two problems i am facing can anyone help me , i will be much obliged

1. when i am using this check in ipn function it return false
if ($this->paypal_class->validate_ipn()) {
}

so what ever i write within this condition that don’t get executed but i know that this function is necessary because it sending back information to paypal for hand saking.

Library using a log file where that file will reside do i need to create this file ,or it will be created by class itself , if i need to create it what will be its location.

2. $this->paypal_class->add_field(‘return’, base_url().’user/regpaysuccess’);

at this page when i return from paypal it show me an alert box regarding this page is not secure do you want to proceed.

how i can disable this .

Thanks a lot