let's say I have a menu as follows:
<div class="menu">
<ul>
<li>dogs</li>
<ul><li>--dog food</li>
<li>--dog collars</li>
</ul>
<li>cats</li>
<li>hamster</li>
</ul>
</div>
CSS code: .menu ul li a:hover, li.active a{background: url(../images/menu-active.png) no-repeat;}
I...