function petInfo(str) {
  earchWin = window.open(str,"Informacion",
  'scrollbars=yes,resizable=yes,width=610,height=600,location=no,toolbar=no,left=200,top=150');
  return false;
}
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("rel") == "external" && anchor.getAttribute("href")) anchor.target = "_blank";
 }
}
window.onload = externalLinks;