function joincheck(what) {
    var fullName = what.firstName.value+what.lastName.value;
    if (fullName == '') {
       alert('enter name!');
       what.firstName.focus();
       return false;
    }
    if(what.email.value == '') {
        alert('email cannot be omitted!');
        what.email.focus();
        return false;
    }
    return true;
  }