function validateEmailFormat(s) { 
  var re = new RegExp("^\\s*[^ @]+@[^ @]+\\.[^ @]+\\s*$"); 
  return re.test(s);
}

var MandatoryTextList = "";
var FirstMandatoryField;
function validateMandatoryFields(field, errorText) {
  if (field.value == "") {
    MandatoryTextList = MandatoryFTextList + "\n" + errorText;
    if (FirstMandatoryField == null) FirstMandatoryField = field;
  }
}

function fixMandatoryFields(header) {
  if (FirstMandatoryField != null) {
    alert(header + "\n" + MandatoryTextList);
    FirstMandatoryField.focus();
  }
}