function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
  if(!anchors[i].href.match('omnistyle.(be|eu)/'))
    {anchors[i].target = "_blank";}
 }
}
window.onload = externalLinks;