Form drop_down problem

[eluser]Michal1[/eluser]
Hello guys I trying to use dropdowns in a simple way and I am having problems with them.

I have a controller site and inside of function index I have:

Code:

$shirts_on_sale = array('small', 'large');
                    $this->load->view('admin_view',$shirts_on_sale);

then in admin_view I have

Code:

<?php echo form_dropdown('shirts', $shirts_on_sale, 'large'); ?>

But I receive an error

Code:

A PHP Error was encountered

Severity: Notice

Message: Undefined variable: shirts_on_sale

A PHP Error was encountered

Severity: Warning

Message: Invalid argument supplied for foreach()

Filename: helpers/form_helper.php

Line Number: 310

why is that? Thanks for any input