function makeExternal() {
	//make sure the function works
	if (! document.getElementsByTagName) { return; }
	var myRegExp = new RegExp("ext","i");
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i<anchors.length; i++) {
		var anchor = anchors[i];
		if (anchor.getAttribute("rel") && anchor.getAttribute("rel").match(myRegExp) ) { anchor.className+=" external"; anchor.target='_blank'; }
	}
}