function box_visibility() {
	if ( document.getElementById( "date_select_box" ).style.visibility == "visible" ) {
		document.getElementById( "date_select_box" ).style.visibility = "hidden"
	} else {
		document.getElementById( "date_select_box" ).style.visibility = "visible"
	}
}

function year_change( mode, page ) {
	if ( mode == 'decrease' ) {
		new_year = eval(document.getElementById("year").innerHTML) - 1
	} else {
		new_year = eval(document.getElementById("year").innerHTML) + 1
	}
	document.getElementById("year").innerHTML = new_year
	for ( i = 1; 1 <= 12; i++ ) {
		document.getElementById('month-' + i ).href = 'http://www.thebasementyork.co.uk/' + page + '/' + new_year + '/' + i + '/'
	}
}