jQuery Forum

I am trying to do an slidedown menu with hover function:
Javascript:
Code:
$(document).ready(function(){
$("#rightmenu ul li").hover(
function () {
$(this).find("ul:first").stop(true, true);
$(this).find("ul:first").slideDown();
},
function () {
$(this).find("ul:first").slideUp('fast');
}
);
});
HTML:
Code:
<div id="rightmenu">
<ul id="ulmenu">
<li>
<a href="#">סנן לפי סגנון</a>
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
</ul>
</li>
</ul></div>
It works fine in IE, but not in FF(it doesn't shown at all)
Here is example - www.rollshop.co.il