function Jp_version(){
 var preadd
 var aftadd
 
     preadd= document.location.href
     aftadd=preadd.replace(/en/,"jp")
     document.location.href=aftadd
}
 
 function En_version(){
 var preadd
 var aftadd
 
     preadd= document.location.href;
     aftadd=preadd.replace(/jp/,"en");
     document.location.href=aftadd;
 }