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("class") == "external") {
			anchor.onclick = function(event){return newWindow(this, event);}
			anchor.onkeypress = function(event){return newWindow(this, event);}
		}
	}
}
function newWindow(anchor, event){
	var keyCode;
	if (event && event.type == 'keypress') {
		if (event.keyCode)
		keyCode = event.keyCode;
		else if (event.which)
		keyCode = event.which;
		// 13 == Return key. 32 == space key
		if (keyCode != 13 && keyCode != 32)
		return true;
	}
	return !window.open(anchor);
}
window.onload = externalLinks;