function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}

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")){
     var rel = anchor.getAttribute("rel");
     if(rel.indexOf("external") != -1) anchor.target = "_blank";
   }
 }
}

function printLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("rel")){
     var rel = anchor.getAttribute("rel");
     if(rel.indexOf("print") != -1) anchor.onclick = "javascript:window.print(); return false";
   }
 }
}

addLoadEvent(externalLinks);