var advertisement_list;
var advertisement_index = 0;

var advertisementTransition = function() {
	advertisement_list.eq(advertisement_index).hide();
	advertisement_index = ( advertisement_index + 1 ) % advertisement_list.size();
	advertisement_list.eq(advertisement_index).show();
};

jQuery(document).ready(function() {
	advertisement_list = jQuery('.advertisement_list .advertisement_show');
	if ( advertisement_list.size() > 1 ) {
                advertisement_list.hide();
		advertisement_list.eq(0).show();
		setInterval( advertisementTransition, 15000 );
	}
});