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.getAttribute("rel") == "pdf"){
        
            anchor.target = "_blank";
            
            anchor.title = "This link will open in a new window";
            
        }
        
    }
    
}

$(function(){

    externalLinks();
    
});