[jQuery] Hover does not work with a#someID ... ?

[jQuery] Hover does not work with a#someID ... ?


Hi there.
Ive got some strange thing here. HTML looks like this:
<div id="presentation">
    <div id="pnext"></div>
    <div id="pprev"></div>
        <div id="pthumbs">
            <ul>
                <li>asdasdsw</li>
                <li>etc ... </li>
            </ul>
        </div>
    <div id="display">&darr; display thumb list</div>
</div>
After "hovering" #display #pthumbs should slide down easly, but it
does'nt happens.
Here's JS:
$('#display').hover(showPNavi, hidePNavi);
    function showPNavi()
    {
        $(this).children('div#pthumbs').css( { opacity :
'0.3' } ).slideDown();
    }
    function hidePNavi()
    {
        $(this).children('div#pthumbs').slideUp();
    }
Im runing it on FF 3. I'll be thankfull for any ideas.