function navi(element){
	var id = element;
	switch (id) {
		case '1':
		document.getElementById('nav1').style.backgroundPosition = '0 -40px';
		document.getElementById('nav2').style.backgroundPosition = '0 0';
		document.getElementById('nav3').style.backgroundPosition = '0 0';
		document.getElementById('nav4').style.backgroundPosition = '0 0';
		document.getElementById('n-1').style.display = 'block';
		document.getElementById('n-2').style.display = 'none';
		document.getElementById('n-3').style.display = 'none';
		document.getElementById('n-4').style.display = 'none';
		break;
		case '2':
		document.getElementById('nav2').style.backgroundPosition = '0 -40px';
		document.getElementById('nav1').style.backgroundPosition = '0 0';
		document.getElementById('nav3').style.backgroundPosition = '0 0';
		document.getElementById('nav4').style.backgroundPosition = '0 0';
		document.getElementById('n-1').style.display = 'none';
		document.getElementById('n-2').style.display = 'block';
		document.getElementById('n-3').style.display = 'none';
		document.getElementById('n-4').style.display = 'none';
		break;
		case '3':
		document.getElementById('nav3').style.backgroundPosition = '0 -40px';
		document.getElementById('nav2').style.backgroundPosition = '0 0';
		document.getElementById('nav1').style.backgroundPosition = '0 0';
		document.getElementById('nav4').style.backgroundPosition = '0 0';
		document.getElementById('n-1').style.display = 'none';
		document.getElementById('n-2').style.display = 'none';
		document.getElementById('n-3').style.display = 'block';
		document.getElementById('n-4').style.display = 'none';
		break;
		case '4':
		document.getElementById('nav4').style.backgroundPosition = '0 -40px';
		document.getElementById('nav2').style.backgroundPosition = '0 0';
		document.getElementById('nav3').style.backgroundPosition = '0 0';
		document.getElementById('nav1').style.backgroundPosition = '0 0';
		document.getElementById('n-1').style.display = 'none';
		document.getElementById('n-2').style.display = 'none';
		document.getElementById('n-3').style.display = 'none';
		document.getElementById('n-4').style.display = 'block';
		break;
		default:
		// nothing
		break;
	}
}