[Theme: Atahualpa] Menu bar with images

ozh menu with images example

I found this piece of code

ul.rMenu li a span {
         margin-left: 30px;
}

ul.rMenu li a:link,
ul.rMenu li a:hover,
ul.rMenu li a:active,
ul.rMenu li a:visited,
ul.rMenu li {
	background: url('/wp-content/themes/atahualpa/images/logo.gif');
        background-repeat:no-repeat ;
        color: #000000;

}

with it I am able to put in front of each menu item a icon/gif
but I need to put different images before different menu items

any help ?
navigation menu items