[eluser]Chathuranga Tennakoon[/eluser]
you have not specified the HTTP method in the form_open function.
Code:
>
<?php echo form_open('users/login', array('id'=>'login')); ?>
just try to add the POST method to form_open function as follows
Code:
>
<?php echo form_open('users/login', array('id'=>'login','method'=>'post')); ?>