function show1() {
	document.getElementById('f1').style.display = "block"
	document.getElementById('f2').style.display = "none"
	document.getElementById('f3').style.display = "none"
}
function show2() {
	document.getElementById('f1').style.display = "none"
	document.getElementById('f2').style.display = "block"
	document.getElementById('f3').style.display = "none"
}
function show3() {
	document.getElementById('f1').style.display = "none"
	document.getElementById('f2').style.display = "none"
	document.getElementById('f3').style.display = "block"
}