function checkEmail(fieldName){
  var result = true;
  if ( fieldName.value.indexOf("@") == -1 || fieldName.value.indexOf(".") == -1 ){
    alert("Please enter a valid email address: for example, jsmith@provider.com");
    //fieldName.value=""
    fieldName.focus();
    result=false;
  }
  return result;
}

function checkRequired(fieldName, fieldLabel){
  var result = true;
  if ( fieldName.value == '' ){
    alert("Please enter a value for the " + fieldLabel + " field.")
    fieldName.focus();
    result=false;
  }
  return result;
}