jQuery(function() {

	var menu_speed = 250;
	var submenu_top = "33px";
	var submenu_top_from = "43px";

	jQuery('#mainNav LI').hover(function() {
		
		var elem = jQuery(this).find('.sub_menu_wrapper');
		
		if(!elem.hasClass('menu_active'))
		{
			elem.addClass('menu_active');
			elem.hide();
			elem.css('top', submenu_top_from);
			elem.animate({
				top: submenu_top
				}, { queue:false, duration: menu_speed });
			elem.fadeTo(menu_speed, 1);
		}
		
	}, function() {
		
		var elem = jQuery(this).find('.sub_menu_wrapper');
		
		elem.show();
		elem.animate({
			top: submenu_top_from
			}, { queue:false, duration: menu_speed });
		elem.fadeTo(menu_speed, 0, function() {
			elem.removeClass('menu_active');
			elem.hide();
			});
		
	});

});