function checkform(oForm) {
  if ((oForm.name.value == "")) {
    alert( "Please enter your name." );
    oForm.name.focus();
    return false ;
  } 
  if ((oForm.email.value == "") && (oForm.phone.value == "")) {
    alert( "Please enter a phone number or an email address." );
    oForm.email.focus();
    return false ;
  }
 
  return true ;
}