How to Redirect within a controller functions with passing id

[eluser]JasmineFlower[/eluser]
Hi,

In my project, i need to redirect from one function to another function within Controller.

My controller name home.php

My first functions:

function post_list($id)
{
..... process using id.....
}

Another function:

function update_post()
{
$id=$this->input->post('id');

....Process done here.............

****** NOW HERE I NEED redirect to post_list function with passing this id******
}