I'm not able to pass "variables" from module to theme

Hi, this is my code:

function kitt_menu(){
$items['quoting'] = array(
'title' => '',
'page callback' => '_kitt_quotes',
'access callback' => TRUE,
'type' => MENU_CALLBACK,
);
return $items;
}

function _kitt_quotes() {
$quotes_array = get_quotes_array();
return theme('quoting', array('quotes' => $quotes_array));
}

function kitt_theme($existing, $type, $theme, $path) {
return array(
'quoting' => array(
'variables' => array('risk' => NULL, 'quotes' => NULL),
)
);
}

i would like to do a simple and obvious thing: i have a variable in my module ($quotes_array) and i want to pass to my theme page. I think i should find it inside $variables in my page template, but i can't find it, it seems that the hook theme doesn't work correctly.
I made some errors in my code?
Can someone help me?
Thanks,

Calcifer