Page menu (pages-widget): Current page item in post

Hi,

I am using Pages Widget in left sidebar.

My WP site has both pages and posts.

My problem is: I cant put background image (highlighting current page) to the post page.
It works fine in page page, but not in post.

I have been styling the Page menu like this:
ATO: CSS INSERTS:
div.widget ul li.current_page_item a, div.widget ul ul li.current_page_item a, div.widget ul ul ul li.current_page_item a {
background-image:url('/wp-content/themes/atahualpa/images/linkin_tausta.png') !important;
color: #4c381d;
font-weight: bold;
padding-top: 4px;
padding-bottom: 6px;
}

Could some help me, please

I am using:
WP 2.9.2.
Atahualpa 3.4.9

Thanks!