function Kiadvany(kiadv_id) 
{
	if(prev_kiadv_div != '') {
		document.getElementById(prev_kiadv_div).style.display = 'none';
	}
	document.getElementById('kiadv-'+kiadv_id).style.display = 'inline';
	prev_kiadv_div = 'kiadv-'+kiadv_id;
}
var prev_kiadv_div = 'kiadv-1';