function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors .length; i++) {
 var anchor = anchors[i];
 if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "openwindow") {
 anchor.target = "_blank";
 anchor.title = (anchor.title != "") ? anchor.title+" (opens in a new window)" : "opens in a new window";
 anchor.className = (anchor.className != '') ? anchor.className+' openwindow' : 'openwindow';
 }
 }
 }
 window.onload = externalLinks;