function show(i){
	switch (i){
		case 1:
			document.getElementById('1').style.display="";
			document.getElementById('2').style.display="none";
			document.getElementById('3').style.display="none";
			break;
		case 2:
			document.getElementById('2').style.display="";
			document.getElementById('1').style.display="none";
			document.getElementById('3').style.display="none";
			break;
		case 3:
			document.getElementById('1').style.display="none";
			document.getElementById('2').style.display="none";
			document.getElementById('3').style.display="";
}
}