var extAnchors = {
	addEvent: function(elm, evType, fn, useCapture){
		if(elm.addEventListener){
			elm.addEventListener(evType, fn, useCapture);
			return true;
		}else if(elm.attachEvent){
			var r = elm.attachEvent('on' + evType, fn);
			return r;
		}else{
			elm['on' + evType] = fn;
		}
	},
	init: function()
	{
		var a = document.getElementsByTagName("a");
		if (!a) return;
		for (var i=0;i<a.length;i++) {
			var anchors = a[i];
			if (anchors.getAttribute("rel") == "external")	{
				//alert(a.length);
				anchors.target = "_blank";	
			}
		}
	}
}
extAnchors.addEvent(document, "load", extAnchors.init, false);