jQuery.noConflict();
jQuery(document).ready(function($){
	
	$("#main_nav li").hover(
        function() { $(this).addClass("m_hover");  },
        function() { $(this).removeClass("m_hover"); }
	);
		$('#main_nav > li').children('ul.drop-down').css({ opacity: 0, display: 'none' })
	$('#main_nav > li').hover(
		function(){ 
			$(this).children('ul.drop-down').css({ display: 'block' }); 
			$(this).children('ul.drop-down').animate({ opacity: 1 }, 'fast'); 
		},
		function(){ 
			$(this).children('ul.drop-down').animate({ opacity: 0 }, 'fast', null, function(){ $(this).css({ display: 'none' }); }); 
		}
	); 

});