$(document).ready(function(){
	$('.catalog a').click(function(){
		var level=$(this).attr('level');
		var next_level=eval(level)+1;
		var $next_level=$(this).parent().find('.menu-list-'+next_level);
		if ($next_level.css('display')!='none' || $next_level.find('li').length==0)
			return true;
		$('.menu-list-'+level+' ul').slideUp(400);	
		$('.menu-list-'+level+' li').attr('class','');
		$(this).parent().attr('class','active');
		$next_level.slideDown(400);	
		return false;
	});	
});