document.observe("dom:loaded", function() {
    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";
        }
	}

	var formBlankers = document.getElementsByTagName("form");

	for (var i=0; i < formBlankers.length; i++) {
		var blanker = formBlankers[i];
		if (blanker.getAttribute("rel") == "external") {
			blanker.target = "_blank";
		}
	}
	
	var areaBlankers = document.getElementsByTagName("area");

	for (var i=0; i < areaBlankers.length; i++) {
        var blanker = areaBlankers[i];
        if (blanker.getAttribute("rel") == "external") {
            blanker.target = "_blank";
        }
    }

});