[Resolved] Resizing Thumbnails, not taking

The thumbnails in my theme were sized to be 290×290. I wanted to change this to 160×160. When I tried to change it via Settings/Media, when I hit save…the setting would just revert to 290×290.

So then I opened up the functions.php file in my theme folder and replaced the sizes in the following as such:

function sight_setup() {
update_option(‘thumbnail_size_w’, 160);
update_option(‘thumbnail_size_h’, 160);
add_image_size( ‘mini-thumbnail’, 50, 50, true );
add_image_size( ‘slide’, 640, 290, true );
register_nav_menu(‘Navigation’, __(‘Navigation’));
register_nav_menu(‘Top menu’, __(‘Top menu’));
}
add_action( ‘init’, ‘sight_setup’ );

Now when I go to Settings/Media, or when I upload a new image, the thumbnail size states 160×160. However, when I go to view my results…it looks the same as before at 290×290. Any Ideas?

I’m using the following theme:
http://wpshower.com/free-wordpress-themes/sight-1-0-free-wordpress-theme/