Add background image to Slide Menu depth 2

[stingerman]

Anyone know how to add a background image to the slide menu's depth 2?

I tried but for some reason it repeats for each <li>.

#dhtmlgoodies_slidedown_menu .slMenuItem_depth2{ /* Sub menu items */
margin-top:1px;
background-image:url('/img.gif');
text-align:center;
font-weight:bold;
}