function popme(el,w,h,s) {
	var ancho = w;
	var alto = h;
	var winl = (screen.width - ancho) / 2;
	var wint = (screen.height - alto) / 2;
	var prop = "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars="+s+",resizable=0,scrolling="+s+",width="+ancho+",height="+alto+",top="+wint+",left="+winl;
	window.open(el, '', prop);
}
function LinksExternos() { 
 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") == "externo") 
     anchor.target = "_blank"; 
 }
}
window.onload = LinksExternos;