var state = 'none';

function showhide(layer_ref) {


	var table = document.getElementById('changestates');
	var rows = table.getElementsByTagName('DIV');

	for (var r=0; r<rows.length; ++r) {
		
		rows[r].style.display = 'none';
			
	}



		hza = document.getElementById(layer_ref);
		hza.style.display = 'block';
}