//Nuestro dominio

var dominio = "cat-barcelona.com";

//var dominio = "catbarcelona.desarrollo";
//var dominio = "dev.cat-barcelona.com";
 //
 function LinksExternos() {
   var Externo;
   if (document.getElementsByTagName('a')) {
     for (var i = 0; (Externo = document.getElementsByTagName('a')[i]); i++) {
      if (Externo.href.indexOf(dominio) == -1) {
         Externo.setAttribute('target', '_blank');
       }
     }
   }
 }
 

function LinksExternosClass() {
if (!document.getElementsByTagName) return;
var anchors = document.getElementsByTagName("a");
for (var i=0; i<anchors.length; i++) {
var anchor = anchors[i];
if (anchor.getAttribute("rel") ==
"linkexterno") anchor.target = "_blank";
}
} 

function addEvent(obj, evType, fn){ 

	if(obj.addEventListener){ 
		obj.addEventListener(evType, fn, false); 
		return true; 
	}else if (obj.attachEvent){ 
		return obj.attachEvent("on" + evType, fn); 
	}else{ 
		return false; 
	} 
 
}

addEvent(window, 'load', LinksExternos);
addEvent(window, 'load', LinksExternosClass);