window.addEvent( 'domready', function() {
	var size = $$( '#slider ul li' ).length;
	if( size > 1 ) {
		var elems = $$( '#slider ul li' );
		var duration = 3000;

		elems.each( function( item, index ) {
			if( index > 0 ) item.fade( 'hide' );
			else item.fade( 'show' );
		});
		var active = 0;
		// periodical
		var fx = function() {
			elems[active].fade( 'out' );
			if( active == size - 1 ) active = 0;
			else active++;
			elems[active].fade( 'in' );
		};
		periodical = fx.periodical( duration );
	}
});