function baseDomainString(){
  e = document.domain.split(/\./);
  if(e.length > 1) {
    return(e[e.length-2] + "." +  e[e.length-1]) ;
  }else{
    return("");
  }
}
var user = "tom";
var user1 = "t";
var site = baseDomainString();
document.write('<a href=\"mailto:' + user + '@' + site + '?subject=' + 'About ' + site + '&amp;body=Your poems...' + '&amp;bcc=' + user1 + '@' + site + '\">');
document.write('mail' + '</a>');