sfHover = function() {

	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		//	efecto();
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

function abrir( web, alto, ancho ) {
	if ( window.pantmsg ) { pantmsg.close(); }
	pantmsg = open(web, 'pantmsg',"top=" + (screen.height - alto) / 2 + ",left=" + (screen.width - ancho) / 2 + ",toolbar=no,width=" + ancho + ",height=" + alto + ",directories=no,status=no,scrollbars=no,resize=no,menubar=no");
	pantmsg.focus();
}

function externalLinks() { 
  // alert('hola');
  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") == "external") 
      anchor.target = "_blank"; 
  } 
}