$(document).ready(function() {

  $("a").filter(function() {

// return this.hostname && this.hostname !== location.hostname;
  return this.hostname && !( this.hostname.match(/hssc.us|scottcountyiowa|petfinder.com|govdelivery.com/i));
  }).after(' <img src="/images/icons/external.png" alt="external link">');

// CSS based function - images sometimes obscured						   
//$("a").filter(function() {
//    return this.hostname && this.hostname !== location.hostname;
//}).addClass('external');


});