function changeUrlJaOn(){
    document.write('<a href="' + changeUrlJa() + '" class="ON">日本語</a>');
}

function changeUrlJaOff(){
    document.write('<a href="' + changeUrlJa() + '">日本語</a>');
}

function changeUrlJa(){
    return document.URL.replace('/en/', '/ja/');
}

function changeUrlEnOn(){
    document.write('<a href="' + changeUrlEn() + '" class="ON">英語</a>');
}

function changeUrlEnOff(){
    document.write('<a href="' + changeUrlEn() + '">英語</a>');
}

function changeUrlEn(){
    return document.URL.replace('/ja/', '/en/');
}

function dispOn(mode, element){
    if (mode == '1') {
        document.getElementById('gallery_top').style.display = 'none';
        document.getElementById('contents').style.display = 'block';
    }
    if (mode == '2') {
        if (element == 'spring') {
            document.getElementById('spring').style.display = 'block';
        }
        else {
            document.getElementById('spring').style.display = 'none';
        }
        if (element == 'summer') {
            document.getElementById('summer').style.display = 'block';
        }
        else {
            document.getElementById('summer').style.display = 'none';
        }
        if (element == 'autumn') {
            document.getElementById('autumn').style.display = 'block';
        }
        else {
            document.getElementById('autumn').style.display = 'none';
        }
        if (element == 'winter') {
            document.getElementById('winter').style.display = 'block';
        }
        else {
            document.getElementById('winter').style.display = 'none';
        }
    }
}