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;

// E-mail anti-spam
function emailantispam(email1, email2, email3, email4){
   emailE = email1 + email2 + '@' + email3 + email4;
document.write('<a href="mailto:' + emailE + '">' + emailE + '</a>')
};