Problem with URLs

[eluser]bondjp[/eluser]
I have this problemn and just don't know how to solve it.
When i put this url:

Code:

http://mysite.com/memb/postback/postback.php?sid=10&name=myname
[

The postback works but if i try to go to other parts of the site i redirects me to the homepage.

If i put this like it should be :

Code:

http://mysite.com/memb/postback.php?sid=10&name=myname

I get a 404 error.
Putting PATH_AUTO it sends me to the homepage.
How can i make this work?

Library:

Code:

class MY_Input extends CI_Input
{
    function MY_Input()
    {
        parent::CI_Input();
        $pos = strrpos($_SERVER['REQUEST_URI'], '?');
        $qry = is_int($pos) ? substr($_SERVER['REQUEST_URI'], ++$pos) : '';
        parse_str($qry, $_GET);
    }
    
}

Config:

Code:

$config['uri_protocol']    = "REQUEST_URI";

Controller "memb":

Code:

function postback(){

                                
        $subid=$this->input->get('sid',TRUE);
        $survey=$this->input->get('name',TRUE);
....................................
}

htaccess

Code:

<IfModule mod_rewrite.c>

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} ^sys.*
RewriteCond $1 !^(index\.php|images|js|captcha|robots\.txt|css)
RewriteRule ^(.*)$ /index.php/$1 [L]


RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]
</IfModule>

<IfModule !mod_rewrite.c>
    # If we don't have mod_rewrite installed, all 404's
    # can be sent to index.php, and everything works as normal.  
    ErrorDocument 404 /index.php
</IfModule>