Javascript conflict?

I’m using the Sidewinder theme, and with the plugin, the Cufon font no longer works, which I’m okay with, but the slide effect in the navigation also doesn’t work.

Here’s the corresponding Javascript – I’m not too familiar with Javascript, but I took out the Cufon.refresh parts in the hopes that that’d solve the issue, but it didn’t.

$('.navigation>li').hover(function(){
			$(this).find('ul').slideDown(function(){
			 	Cufon.refresh('ul.navigation li');
			});
		},
  		function () {
  			$(this).find('ul').stop(true, true).slideUp(function(){
  				Cufon.refresh('ul.navigation li');
  			});
  		});

(Otherwise, the plugin is perfect and exactly what I was looking for! Really well-designed!)