var trunk_before_change = ''; 
function changeTrunkShow(value) {
	$("#trunk_shows_for_"+ trunk_before_change).fadeTo(500, 0);
	$("#trunk_shows_for_"+ trunk_before_change).hide();
	$("#trunk_shows_for_"+ value).show();	
	$("#trunk_shows_for_"+ value).fadeTo(500, 1);
	
	trunk_before_change = value;
}