function checkForm(){
  var emailElem = document.getElementById("email");
  var emailText = emailElem.value.replace(/^\s+|\s+$/g,"");
  if (!emailText.match(/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i)){
     alert(emailElem.errorText);
     return false;
  }
  var nameElem = document.getElementById("forename");
  var name = nameElem.value.replace(/^\s+|\s+$/g,"");
  if (!name||name==""){
     alert(nameElem.errorText);
     return false;
  }
  var surnameElem = document.getElementById("surname");
  var surname = nameElem.value.replace(/^\s+|\s+$/g,"");
  if (!surname||surname==""){
     alert(surnameElem.errorText);
     return false;
  }
  return true;
}