//alternativa al target _blank STRICT
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("href") && 
       anchor.getAttribute("rel") == "external") 
     anchor.target = "_blank"; 
 } 
} 

window.onload = externalLinks;

function divOnOff(objid,vis)
{
	var obj;
	try {
		if(objid.parentNode){
			//it's an object. we needn't do anything
			obj = objid;
		} else {
			//it's not an object
			obj = document.getElementById(objid);
		}
	} catch(e) {
		//it's not an object and the browser errors on undefined properties
		obj = document.getElementById(objid);
	}
	if(vis){		
		if (obj.style.visibility == 'hidden') {
			obj.style.visibility = 'visible';
		} else {
			obj.style.visibility = 'hidden';
		}
	} else {
		if (obj.style.display == 'none') {
			obj.style.display = 'block';
		} else {
			obj.style.display = 'none';
		}
	}
	return true;
}