How to make menu img show only on parent

I have been trying to add a little img infront of the menu items, and so far it is working with:

div#menu1 li {
padding: 0px 0px 0px 30px;
background:url(wp-content/themes/atahualpa/images/flower.gif) no-repeat;

Thing is just that the img shows on ALL items, and I would like it to only show on the parent items, and not on the sub items.

The url is http://www.enjoy-it.dk

what should I add/remove?

Thanks
Marius