if (top.location != self.location)
{
	top.location.replace(self.location);
}

window.onload = prepararLinks;

function prepararLinks() 
{
  	if (!document.getElementsByTagName)
 		return false;
    var anchors = document.getElementsByTagName("a");
    for (var i=0; i < anchors.length; i++ ) {
     	if (anchors[i].className == "externo") {
			anchors[i].onclick = function() {
				popUp(this.getAttribute("href"));
				return false;
			}
		}
	}	
}

function popUp(winURL) 
{
	window.open(winURL);
}