var last_open = null;

function close_news(){
	elem = document.getElementById('news');
	elem.style.display = 'none';
}
function show_detail(id){
	if(last_open != null && last_open != id){
		set_class('info' + last_open, 'concert_info_show');
		set_class('det' + last_open, 'concert_details_hide');
	}
	last_open=id;
	set_class('det' + id, 'concert_details_show');
	set_class('info' + id, 'concert_info_hide');
}

function close_detail(id){
	last_open=null;
	set_class('info' + id, 'concert_info_show');
	set_class('det' + id, 'concert_details_hide');
}

function set_class(id, cls){
	elem = document.getElementById(id);
	elem.className = cls;
}

function open_tr(id_tr){
	elem = document.getElementById(id_tr);
	elem.style.display = 'table-row';
}
function close_tr(id_tr){
	elem = document.getElementById(id_tr);
	elem.style.display = 'none';
}
var sel_msg = 1;
function show_next(){
	sel_msg += 2;
	for(var i=1; i<=10; i++){
		elem = document.getElementById('msg'+i);
		if(i==sel_msg || i==sel_msg+1){
			elem.style.display = 'block';
		}else{
			elem.style.display = 'none';
		}
	}
	navig_msg();
}
function show_prev(){
	sel_msg -= 2;
	for(var i=1; i<=10; i++){
		elem = document.getElementById('msg'+i);
		if(i==sel_msg || i==sel_msg+1){
			elem.style.display = 'block';
		}else{
			elem.style.display = 'none';
		}
	}
	navig_msg();
}
function navig_msg(){
	elemp = document.getElementById('btp');
	elempt = document.getElementById('btpt');
	elemn = document.getElementById('btn');
	elemnt = document.getElementById('btnt');
	
	if(sel_msg > 1){
		elemp.style.display = 'block';
		elempt.style.display = 'none';
	}else{
		elemp.style.display = 'none';
		elempt.style.display = 'block';
	}
	if(sel_msg < 9){
		elemn.style.display = 'block';
		elemnt.style.display = 'none';
	}else{
		elemn.style.display = 'none';
		elemnt.style.display = 'block';
	}
}