[Deff]

A.N.R.I,
Так ?

<script type="text/javascript" src="http://yandex.st/jquery/1.4.4/jquery.min.js"></script>

<style type="text/css">
ul.tree li{
 background-color:#F7F7F7;
}
ul.tree li.over{
 background-color:#6CE26C;
}
ul.tree li:not(.over){
 background-color:#F7F7F7;
}
</style>


<script type="text/javascript">
$(document).ready(function(){

    $(" ul.tree li").mouseover(function(){
		if(!$(this).find('li.over').length){$(this).addClass('over')};
    }).mouseout(function(){
		$(this).removeClass('over');
    });

});
</script>


<ul class="tree dynamized" style="display: block; "><li>
	<span class="grower CLOSE"> </span>
	<a href="" title="">1 level</a>
		<ul style=" ">
			<li>
				<a href="" title="">2 level </a>
			</li>						
																			
		</ul>
	</li>													
	<li>
		<span class="grower CLOSE"> </span>
		<a href="" title="">1 level</a>
		<ul style=" ">
			<li>
				<span class="grower OPEN"> </span>
				<a href="" title="">2 level</a>
				<ul style="display: block; ">
					<li>
						<a href="" class="selected" title="">3 level</a>
					</li>						
					<li class="last">
						<a href="" title="">3 level</a>
					</li>						
				</ul>
			</li>						
																	
		</ul>
	</li>						
</ul>