Problem: WP_Query always show all posts instead of from just one category

I’ve got a problem with WP_Query and I was wondering if someone could help.

I’m registering a widget in the functions.php file of my theme, but the WP_Query command keeps returning all posts, while I am specifying a category. This is the code:

add_action('init','initTVwidget');
function initTVwidget() {
	if ( function_exists('register_sidebar_widget') )
		register_sidebar_widget(__('TV and player'), 'widget_tvAndCartoonPlayer');
}

function widget_tvAndCartoonPlayer() {
	$blog_posts = new WP_Query('showposts=2&cat=25');
	print_r($blog_posts);
}

Is there a scope problem? Because when I place the same WP_Query code snippet outside of the function in the functions.php it works.