function showManagePictures() {

	var div = document.getElementById('manage_pictures');
	if (div.style.display == 'none') {
		div.style.display = '';
		document.getElementById('manage_pictures_arrow').style.background = "url('/images/sipka_active.png')";
	} else {
		div.style.display = 'none';
		document.getElementById('manage_pictures_arrow').style.background = "url('/images/sipka.png')";
	}
}

function showConcertsByYear(year) {

	var div = document.getElementById('concerts_year_table_'+year);
	if (div.style.display == 'none') {
		div.style.display = '';
		document.getElementById('show_concerts_arrow_'+year).style.background = "url('/images/sipka_active.png')";
	} else {
		div.style.display = 'none';
		document.getElementById('show_concerts_arrow_'+year).style.background = "url('/images/sipka.png')";
	}
}


function showManageFiles() {
	
	var div = document.getElementById('manage_files');
	if (div.style.display == 'none') {
		div.style.display = '';
		document.getElementById('manage_files_arrow').style.background = "url('/images/sipka_active.png')";
	} else {
		div.style.display = 'none';
		document.getElementById('manage_files_arrow').style.background = "url('/images/sipka.png')";
	}
}


function showActualVersion() {
	
	var div = document.getElementById('actual_version');
	if (div.style.display == 'none') {
		div.style.display = '';
		document.getElementById('actual_version_arrow').style.background = "url('/images/sipka_active.png')";
	} else {
		div.style.display = 'none';
		document.getElementById('actual_version_arrow').style.background = "url('/images/sipka.png')";
	}
}


function showManageVersions() {
	
	var div = document.getElementById('manage_versions');
	if (div.style.display == 'none') {
		div.style.display = '';
		document.getElementById('manage_versions_arrow').style.background = "url('/images/sipka_active.png')";
	} else {
		div.style.display = 'none';
		document.getElementById('manage_versions_arrow').style.background = "url('/images/sipka.png')";
	}
}