$(document).ready(function(){
	$('#bt_1').click(function(){
		$('.bolt1').addClass('selected');
		$('.bolt2').removeClass('selected');
		$('.bolt3').removeClass('selected');
		$('.bolt4').removeClass('selected');
	});

	$('#bt_2').click(function(){
		$('.bolt2').addClass('selected');
		$('.bolt1').removeClass('selected');
		$('.bolt3').removeClass('selected');
		$('.bolt4').removeClass('selected');
	});

	$('#bt_3').click(function(){
		$('.bolt3').addClass('selected');
		$('.bolt2').removeClass('selected');
		$('.bolt1').removeClass('selected');
		$('.bolt4').removeClass('selected');
	});

	$('#bt_4').click(function(){
		$('.bolt4').addClass('selected');
		$('.bolt2').removeClass('selected');
		$('.bolt3').removeClass('selected');
		$('.bolt1').removeClass('selected');
	});
});