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"; 
} 

var forms = document.getElementsByTagName("form"); 
for(var i = 0; i < forms.length; i++) 
{ 
var form = forms[i]; 
if(form.getAttribute("action").substring(0, 4) == "http") 
{ 
form.target = "_blank"; 
} 
} 
}