var strDomainName = location.hostname;

function setDefaultCountry() {

if (strDomainName == 'www.manutd.jp') {
    document.getElementById('ctl01_ctl03_shortRegistration_ddlCountry').value='日本';
} else if (strDomainName == 'www.manutd.kr') {
    document.getElementById('ctl01_ctl03_shortRegistration_ddlCountry').value='대한민국';
} else if (strDomainName == 'www.manunited.com.cn') {
    document.getElementById('ctl01_ctl03_shortRegistration_ddlCountry').value='中国';
} else if (strDomainName == 'www.manutdsc.imgdigital.org') {
document.getElementById('ctl01_ctl03_shortRegistration_ddlCountry').value='日本';   
}
}