thisURL = new String(document.URL);
if (thisURL.match("_en")) {
begNum = thisURL.lastIndexOf("/")+1;
endNum= thisURL.lastIndexOf("_en");
theFileName = thisURL.substring(begNum,endNum);
}else{
begNum = thisURL.lastIndexOf("/")+1;
endNum= thisURL.lastIndexOf(".");
theFileName = thisURL.substring(begNum,endNum);
}

function jpLink(){
location.href = theFileName+".html";
}

function enLink(){
location.href = theFileName+"_en.html";
}