window.addEventListener?window.addEventListener("load",externalLinks,false):window.attachEvent("onload",externalLinks);

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") == "external")
				anchor.target = "_blank";
				}
    }//end function