How to find out user is in index

[eluser]Samus[/eluser]
[quote author="Hamed" date="1338301679"]does not work for me.[/quote]
because you haven't defined index_page().
do something like..

Code:

$index_page = '/';

then

Code:

$this->load->helper('url');
if($index_page == current_url()) echo "user is at root";