function showhide(id){
        document.getElementById("textdefe").style.display = "none";
		document.getElementById("tochigi").style.display = "none";
		document.getElementById("gunma").style.display = "none";
		document.getElementById("saitama").style.display = "none";
		document.getElementById("tokyo").style.display = "none";
		document.getElementById("yamanashi").style.display = "none";
		document.getElementById("kanagawa").style.display = "none";	
		document.getElementById("chiba").style.display = "none";
		document.getElementById("shizuoka").style.display = "none";		
		document.getElementById("aichi").style.display = "none";
		document.getElementById("mie").style.display = "none";
		document.getElementById("osaka").style.display = "none";
		document.getElementById("nara").style.display = "none";

        document.getElementById(id).style.display = "block";
		
if (id == "textdefe") {
document.getElementById("backbt").style.display = "none";
}else{
document.getElementById("backbt").style.display = "block";
}


 }