function make () {
  var c = '@';
  var r = '';
  for (var i=0; i < arguments.length; i++) {
    r = r + arguments[i];
    var c;
    switch (i) {
    case 0:
        if (arguments[i] == "jo") {
            c = 'bs@fact';
        } else {
            c = 'm@fact';
        }
        break;
    case 1: c = 's'; break;
    default: c = '.';
    }
    if (i != arguments.length - 1) {
      r = r + c;
    }
  }
  return r + '.com';
}

var j = make ('jo', 'isre', 'earch');
var t = make ('tea', 'isre', 'earch');