$(document).ready(function(){
    
    //open external links in new window 
    $('a[href^="http://"]').filter(function(){
    return this.hostname && this.hostname !== location.hostname; })
        .addClass("ext_link")
       // .attr({ title: "Link will open in new window" })
        .click( function() {
            window.open(this.href);
            return false;
        }); 
                                                  
});